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cifs: allocate buffer in the caller of build_path_from_dentry()

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build_path_from_dentry() open-codes dentry_path_raw().  The reason
we can't use dentry_path_raw() in there (and postprocess the
result as needed) is that the callers of build_path_from_dentry()
expect that the object to be freed on cleanup and the string to
be used are at the same address.  That's painful, since the path
is naturally built end-to-beginning - we start at the leaf and
go through the ancestors, accumulating the pathname.

Life would be easier if we left the buffer allocation to callers.
It wouldn't be exact-sized buffer, but none of the callers keep
the result for long - it's always freed before the caller returns.
So there's no need to do exact-sized allocation; better use
__getname()/__putname(), same as we do for pathname arguments
of syscalls.  What's more, there's no need to do allocation under
spinlocks, so GFP_ATOMIC is not needed.

Next patch will replace the open-coded dentry_path_raw() (in
build_path_from_dentry_optional_prefix()) with calling the real
thing.  This patch only introduces wrappers for allocating/freeing
the buffers and switches to new calling conventions:
	build_path_from_dentry(dentry, buf)
expects buf to be address of a page-sized object or NULL,
return value is a pathname built inside that buffer on success,
ERR_PTR(-ENOMEM) if buf is NULL and ERR_PTR(-ENAMETOOLONG) if
the pathname won't fit into page.  Note that we don't need to
check for failure when allocating the buffer in the caller -
build_path_from_dentry() will do the right thing.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Al Viro 2021-03-05 17:36:04 -05:00 committed by Steve French
parent 8e33cf20ce
commit f6a9bc336b
10 changed files with 212 additions and 178 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
fs/cifs/cifs_dfs_ref.c
View File

@ -302,6 +302,7 @@ static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
struct cifs_sb_info *cifs_sb;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
void *page;
char *full_path, *root_path;
unsigned int xid;
int rc;
@ -324,10 +325,13 @@ static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
goto cdda_exit;
}
page = alloc_dentry_path();
/* always use tree name prefix */
full_path = build_path_from_dentry_optional_prefix(mntpt, true);
if (full_path == NULL)
goto cdda_exit;
full_path = build_path_from_dentry_optional_prefix(mntpt, page, true);
if (IS_ERR(full_path)) {
mnt = ERR_CAST(full_path);
goto free_full_path;
}
convert_delimiter(full_path, '\\');
@ -385,7 +389,7 @@ static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
free_root_path:
kfree(root_path);
free_full_path:
kfree(full_path);
free_dentry_path(page);
cdda_exit:
cifs_dbg(FYI, "leaving %s\n" , __func__);
return mnt;

15
fs/cifs/cifsproto.h
View File

@ -69,9 +69,20 @@ extern int init_cifs_idmap(void);
extern void exit_cifs_idmap(void);
extern int init_cifs_spnego(void);
extern void exit_cifs_spnego(void);
extern const char *build_path_from_dentry(struct dentry *);
extern const char *build_path_from_dentry(struct dentry *, void *);
extern char *build_path_from_dentry_optional_prefix(struct dentry *direntry,
bool prefix);
void *page, bool prefix);
static inline void *alloc_dentry_path(void)
{
return __getname();
}
static inline void free_dentry_path(void *page)
{
if (page)
__putname(page);
}
extern char *cifs_build_path_to_root(struct smb3_fs_context *ctx,
struct cifs_sb_info *cifs_sb,
struct cifs_tcon *tcon,

69
fs/cifs/dir.c
View File

@ -79,29 +79,33 @@ cifs_build_path_to_root(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_s
/* Note: caller must free return buffer */
const char *
build_path_from_dentry(struct dentry *direntry)
build_path_from_dentry(struct dentry *direntry, void *page)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
return build_path_from_dentry_optional_prefix(direntry,
return build_path_from_dentry_optional_prefix(direntry, page,
prefix);
}
char *
build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
bool prefix)
{
struct dentry *temp;
int namelen;
int dfsplen;
int pplen = 0;
char *full_path;
char *full_path = page;
char dirsep;
struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
unsigned seq;
if (unlikely(!page))
return ERR_PTR(-ENOMEM);
dirsep = CIFS_DIR_SEP(cifs_sb);
if (prefix)
dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
@ -118,17 +122,12 @@ cifs_bp_rename_retry:
for (temp = direntry; !IS_ROOT(temp);) {
namelen += (1 + temp->d_name.len);
temp = temp->d_parent;
if (temp == NULL) {
cifs_dbg(VFS, "corrupt dentry\n");
rcu_read_unlock();
return NULL;
}
}
rcu_read_unlock();
full_path = kmalloc(namelen+1, GFP_ATOMIC);
if (full_path == NULL)
return full_path;
if (namelen >= PAGE_SIZE)
return ERR_PTR(-ENAMETOOLONG);
full_path[namelen] = 0; /* trailing null */
rcu_read_lock();
for (temp = direntry; !IS_ROOT(temp);) {
@ -145,12 +144,6 @@ cifs_bp_rename_retry:
}
spin_unlock(&temp->d_lock);
temp = temp->d_parent;
if (temp == NULL) {
cifs_dbg(VFS, "corrupt dentry\n");
rcu_read_unlock();
kfree(full_path);
return NULL;
}
}
rcu_read_unlock();
if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
@ -159,7 +152,6 @@ cifs_bp_rename_retry:
/* presumably this is only possible if racing with a rename
of one of the parent directories (we can not lock the dentries
above us to prevent this, but retrying should be harmless) */
kfree(full_path);
goto cifs_bp_rename_retry;
}
/* DIR_SEP already set for byte 0 / vs \ but not for
@ -233,7 +225,8 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
int desired_access;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_tcon *tcon = tlink_tcon(tlink);
const char *full_path = NULL;
const char *full_path;
void *page = alloc_dentry_path();
FILE_ALL_INFO *buf = NULL;
struct inode *newinode = NULL;
int disposition;
@ -244,9 +237,11 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
if (tcon->ses->server->oplocks)
*oplock = REQ_OPLOCK;
full_path = build_path_from_dentry(direntry);
if (!full_path)
return -ENOMEM;
full_path = build_path_from_dentry(direntry, page);
if (IS_ERR(full_path)) {
free_dentry_path(page);
return PTR_ERR(full_path);
}
if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
@ -448,7 +443,7 @@ cifs_create_set_dentry:
out:
kfree(buf);
kfree(full_path);
free_dentry_path(page);
return rc;
out_err:
@ -619,7 +614,8 @@ int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
const char *full_path = NULL;
const char *full_path;
void *page;
if (!old_valid_dev(device_number))
return -EINVAL;
@ -629,13 +625,13 @@ int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
if (IS_ERR(tlink))
return PTR_ERR(tlink);
page = alloc_dentry_path();
tcon = tlink_tcon(tlink);
xid = get_xid();
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
full_path = build_path_from_dentry(direntry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto mknod_out;
}
@ -644,7 +640,7 @@ int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
device_number);
mknod_out:
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@ -660,7 +656,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
struct inode *newInode = NULL;
const char *full_path = NULL;
const char *full_path;
void *page;
xid = get_xid();
@ -687,11 +684,13 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
/* can not grab the rename sem here since it would
deadlock in the cases (beginning of sys_rename itself)
in which we already have the sb rename sem */
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
page = alloc_dentry_path();
full_path = build_path_from_dentry(direntry, page);
if (IS_ERR(full_path)) {
cifs_put_tlink(tlink);
free_xid(xid);
return ERR_PTR(-ENOMEM);
free_dentry_path(page);
return ERR_CAST(full_path);
}
if (d_really_is_positive(direntry)) {
@ -727,7 +726,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
}
newInode = ERR_PTR(rc);
}
kfree(full_path);
free_dentry_path(page);
cifs_put_tlink(tlink);
free_xid(xid);
return d_splice_alias(newInode, direntry);

75
fs/cifs/file.c
View File

@ -530,7 +530,8 @@ int cifs_open(struct inode *inode, struct file *file)
struct cifs_tcon *tcon;
struct tcon_link *tlink;
struct cifsFileInfo *cfile = NULL;
const char *full_path = NULL;
void *page;
const char *full_path;
bool posix_open_ok = false;
struct cifs_fid fid;
struct cifs_pending_open open;
@ -546,9 +547,10 @@ int cifs_open(struct inode *inode, struct file *file)
tcon = tlink_tcon(tlink);
server = tcon->ses->server;
full_path = build_path_from_dentry(file_dentry(file));
if (full_path == NULL) {
rc = -ENOMEM;
page = alloc_dentry_path();
full_path = build_path_from_dentry(file_dentry(file), page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto out;
}
@ -640,7 +642,7 @@ int cifs_open(struct inode *inode, struct file *file)
}
out:
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@ -689,7 +691,8 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
struct TCP_Server_Info *server;
struct cifsInodeInfo *cinode;
struct inode *inode;
const char *full_path = NULL;
void *page;
const char *full_path;
int desired_access;
int disposition = FILE_OPEN;
int create_options = CREATE_NOT_DIR;
@ -699,9 +702,8 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
mutex_lock(&cfile->fh_mutex);
if (!cfile->invalidHandle) {
mutex_unlock(&cfile->fh_mutex);
rc = 0;
free_xid(xid);
return rc;
return 0;
}
inode = d_inode(cfile->dentry);
@ -715,12 +717,13 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
* called and if the server was down that means we end up here, and we
* can never tell if the caller already has the rename_sem.
*/
full_path = build_path_from_dentry(cfile->dentry);
if (full_path == NULL) {
rc = -ENOMEM;
page = alloc_dentry_path();
full_path = build_path_from_dentry(cfile->dentry, page);
if (IS_ERR(full_path)) {
mutex_unlock(&cfile->fh_mutex);
free_dentry_path(page);
free_xid(xid);
return rc;
return PTR_ERR(full_path);
}
cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n",
@ -838,7 +841,7 @@ reopen_success:
cifs_relock_file(cfile);
reopen_error_exit:
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
return rc;
}
@ -2069,34 +2072,31 @@ cifs_get_writable_path(struct cifs_tcon *tcon, const char *name,
int flags,
struct cifsFileInfo **ret_file)
{
struct list_head *tmp;
struct cifsFileInfo *cfile;
struct cifsInodeInfo *cinode;
const char *full_path;
void *page = alloc_dentry_path();
*ret_file = NULL;
spin_lock(&tcon->open_file_lock);
list_for_each(tmp, &tcon->openFileList) {
cfile = list_entry(tmp, struct cifsFileInfo,
tlist);
full_path = build_path_from_dentry(cfile->dentry);
if (full_path == NULL) {
list_for_each_entry(cfile, &tcon->openFileList, tlist) {
struct cifsInodeInfo *cinode;
const char *full_path = build_path_from_dentry(cfile->dentry, page);
if (IS_ERR(full_path)) {
spin_unlock(&tcon->open_file_lock);
return -ENOMEM;
free_dentry_path(page);
return PTR_ERR(full_path);
}
if (strcmp(full_path, name)) {
kfree(full_path);
if (strcmp(full_path, name))
continue;
}
kfree(full_path);
cinode = CIFS_I(d_inode(cfile->dentry));
spin_unlock(&tcon->open_file_lock);
free_dentry_path(page);
return cifs_get_writable_file(cinode, flags, ret_file);
}
spin_unlock(&tcon->open_file_lock);
free_dentry_path(page);
return -ENOENT;
}
@ -2104,35 +2104,32 @@ int
cifs_get_readable_path(struct cifs_tcon *tcon, const char *name,
struct cifsFileInfo **ret_file)
{
struct list_head *tmp;
struct cifsFileInfo *cfile;
struct cifsInodeInfo *cinode;
const char *full_path;
void *page = alloc_dentry_path();
*ret_file = NULL;
spin_lock(&tcon->open_file_lock);
list_for_each(tmp, &tcon->openFileList) {
cfile = list_entry(tmp, struct cifsFileInfo,
tlist);
full_path = build_path_from_dentry(cfile->dentry);
if (full_path == NULL) {
list_for_each_entry(cfile, &tcon->openFileList, tlist) {
struct cifsInodeInfo *cinode;
const char *full_path = build_path_from_dentry(cfile->dentry, page);
if (IS_ERR(full_path)) {
spin_unlock(&tcon->open_file_lock);
return -ENOMEM;
free_dentry_path(page);
return PTR_ERR(full_path);
}
if (strcmp(full_path, name)) {
kfree(full_path);
if (strcmp(full_path, name))
continue;
}
kfree(full_path);
cinode = CIFS_I(d_inode(cfile->dentry));
spin_unlock(&tcon->open_file_lock);
free_dentry_path(page);
*ret_file = find_readable_file(cinode, 0);
return *ret_file ? 0 : -ENOENT;
}
spin_unlock(&tcon->open_file_lock);
free_dentry_path(page);
return -ENOENT;
}

104
fs/cifs/inode.c
View File

@ -1609,7 +1609,8 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
{
int rc = 0;
unsigned int xid;
const char *full_path = NULL;
const char *full_path;
void *page;
struct inode *inode = d_inode(dentry);
struct cifsInodeInfo *cifs_inode;
struct super_block *sb = dir->i_sb;
@ -1629,6 +1630,7 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
server = tcon->ses->server;
xid = get_xid();
page = alloc_dentry_path();
if (tcon->nodelete) {
rc = -EACCES;
@ -1637,9 +1639,9 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
/* Unlink can be called from rename so we can not take the
* sb->s_vfs_rename_mutex here */
full_path = build_path_from_dentry(dentry);
if (full_path == NULL) {
rc = -ENOMEM;
full_path = build_path_from_dentry(dentry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto unlink_out;
}
@ -1713,7 +1715,7 @@ out_reval:
cifs_inode = CIFS_I(dir);
CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
unlink_out:
kfree(full_path);
free_dentry_path(page);
kfree(attrs);
free_xid(xid);
cifs_put_tlink(tlink);
@ -1867,6 +1869,7 @@ int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
const char *full_path;
void *page;
cifs_dbg(FYI, "In cifs_mkdir, mode = %04ho inode = 0x%p\n",
mode, inode);
@ -1879,9 +1882,10 @@ int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
xid = get_xid();
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
page = alloc_dentry_path();
full_path = build_path_from_dentry(direntry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto mkdir_out;
}
@ -1924,7 +1928,7 @@ mkdir_out:
* attributes are invalid now.
*/
CIFS_I(inode)->time = 0;
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@ -1938,16 +1942,17 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
struct tcon_link *tlink;
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
const char *full_path = NULL;
const char *full_path;
void *page = alloc_dentry_path();
struct cifsInodeInfo *cifsInode;
cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
xid = get_xid();
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
full_path = build_path_from_dentry(direntry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto rmdir_exit;
}
@ -1997,7 +2002,7 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
current_time(inode);
rmdir_exit:
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
return rc;
}
@ -2072,8 +2077,8 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
struct dentry *source_dentry, struct inode *target_dir,
struct dentry *target_dentry, unsigned int flags)
{
const char *from_name = NULL;
const char *to_name = NULL;
const char *from_name, *to_name;
void *page1, *page2;
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
@ -2091,21 +2096,19 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
return PTR_ERR(tlink);
tcon = tlink_tcon(tlink);
page1 = alloc_dentry_path();
page2 = alloc_dentry_path();
xid = get_xid();
/*
* we already have the rename sem so we do not need to
* grab it again here to protect the path integrity
*/
from_name = build_path_from_dentry(source_dentry);
if (from_name == NULL) {
rc = -ENOMEM;
from_name = build_path_from_dentry(source_dentry, page1);
if (IS_ERR(from_name)) {
rc = PTR_ERR(from_name);
goto cifs_rename_exit;
}
to_name = build_path_from_dentry(target_dentry);
if (to_name == NULL) {
rc = -ENOMEM;
to_name = build_path_from_dentry(target_dentry, page2);
if (IS_ERR(to_name)) {
rc = PTR_ERR(to_name);
goto cifs_rename_exit;
}
@ -2177,8 +2180,8 @@ unlink_target:
cifs_rename_exit:
kfree(info_buf_source);
kfree(from_name);
kfree(to_name);
free_dentry_path(page2);
free_dentry_path(page1);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@ -2317,7 +2320,8 @@ int cifs_revalidate_dentry_attr(struct dentry *dentry)
int rc = 0;
struct inode *inode = d_inode(dentry);
struct super_block *sb = dentry->d_sb;
const char *full_path = NULL;
const char *full_path;
void *page;
int count = 0;
if (inode == NULL)
@ -2328,11 +2332,10 @@ int cifs_revalidate_dentry_attr(struct dentry *dentry)
xid = get_xid();
/* can not safely grab the rename sem here if rename calls revalidate
since that would deadlock */
full_path = build_path_from_dentry(dentry);
if (full_path == NULL) {
rc = -ENOMEM;
page = alloc_dentry_path();
full_path = build_path_from_dentry(dentry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto out;
}
@ -2351,7 +2354,7 @@ again:
if (rc == -EAGAIN && count++ < 10)
goto again;
out:
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
return rc;
@ -2613,7 +2616,8 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
{
int rc;
unsigned int xid;
const char *full_path = NULL;
const char *full_path;
void *page = alloc_dentry_path();
struct inode *inode = d_inode(direntry);
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
@ -2634,9 +2638,9 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
if (rc < 0)
goto out;
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
full_path = build_path_from_dentry(direntry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto out;
}
@ -2748,7 +2752,7 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
cifsInode->time = 0;
out:
kfree(args);
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
return rc;
}
@ -2764,7 +2768,8 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifsFileInfo *wfile;
struct cifs_tcon *tcon;
const char *full_path = NULL;
const char *full_path;
void *page = alloc_dentry_path();
int rc = -EACCES;
__u32 dosattr = 0;
__u64 mode = NO_CHANGE_64;
@ -2778,16 +2783,13 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
attrs->ia_valid |= ATTR_FORCE;
rc = setattr_prepare(&init_user_ns, direntry, attrs);
if (rc < 0) {
free_xid(xid);
return rc;
}
if (rc < 0)
goto cifs_setattr_exit;
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
free_xid(xid);
return rc;
full_path = build_path_from_dentry(direntry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto cifs_setattr_exit;
}
/*
@ -2937,8 +2939,8 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
mark_inode_dirty(inode);
cifs_setattr_exit:
kfree(full_path);
free_xid(xid);
free_dentry_path(page);
return rc;
}

11
fs/cifs/ioctl.c
View File

@ -43,12 +43,15 @@ static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
struct dentry *dentry = filep->f_path.dentry;
const unsigned char *path;
void *page = alloc_dentry_path();
__le16 *utf16_path = NULL, root_path;
int rc = 0;
path = build_path_from_dentry(dentry);
if (path == NULL)
return -ENOMEM;
path = build_path_from_dentry(dentry, page);
if (IS_ERR(path)) {
free_dentry_path(page);
return PTR_ERR(path);
}
cifs_dbg(FYI, "%s %s\n", __func__, path);
@ -73,7 +76,7 @@ static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
ici_exit:
if (utf16_path != &root_path)
kfree(utf16_path);
kfree(path);
free_dentry_path(page);
return rc;
}

46
fs/cifs/link.c
View File

@ -510,8 +510,8 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
{
int rc = -EACCES;
unsigned int xid;
const char *from_name = NULL;
const char *to_name = NULL;
const char *from_name, *to_name;
void *page1, *page2;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink;
struct cifs_tcon *tcon;
@ -524,11 +524,17 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
tcon = tlink_tcon(tlink);
xid = get_xid();
page1 = alloc_dentry_path();
page2 = alloc_dentry_path();
from_name = build_path_from_dentry(old_file);
to_name = build_path_from_dentry(direntry);
if ((from_name == NULL) || (to_name == NULL)) {
rc = -ENOMEM;
from_name = build_path_from_dentry(old_file, page1);
if (IS_ERR(from_name)) {
rc = PTR_ERR(from_name);
goto cifs_hl_exit;
}
to_name = build_path_from_dentry(direntry, page2);
if (IS_ERR(to_name)) {
rc = PTR_ERR(to_name);
goto cifs_hl_exit;
}
@ -587,8 +593,8 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
}
cifs_hl_exit:
kfree(from_name);
kfree(to_name);
free_dentry_path(page1);
free_dentry_path(page2);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@ -600,7 +606,8 @@ cifs_get_link(struct dentry *direntry, struct inode *inode,
{
int rc = -ENOMEM;
unsigned int xid;
const char *full_path = NULL;
const char *full_path;
void *page;
char *target_path = NULL;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink = NULL;
@ -620,11 +627,13 @@ cifs_get_link(struct dentry *direntry, struct inode *inode,
tcon = tlink_tcon(tlink);
server = tcon->ses->server;
full_path = build_path_from_dentry(direntry);
if (!full_path) {
page = alloc_dentry_path();
full_path = build_path_from_dentry(direntry, page);
if (IS_ERR(full_path)) {
free_xid(xid);
cifs_put_tlink(tlink);
return ERR_PTR(-ENOMEM);
free_dentry_path(page);
return ERR_CAST(full_path);
}
cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode);
@ -649,7 +658,7 @@ cifs_get_link(struct dentry *direntry, struct inode *inode,
&target_path, reparse_point);
}
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
if (rc != 0) {
@ -669,7 +678,8 @@ cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
const char *full_path = NULL;
const char *full_path;
void *page = alloc_dentry_path();
struct inode *newinode = NULL;
xid = get_xid();
@ -681,9 +691,9 @@ cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
}
pTcon = tlink_tcon(tlink);
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
full_path = build_path_from_dentry(direntry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto symlink_exit;
}
@ -719,7 +729,7 @@ cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
}
}
symlink_exit:
kfree(full_path);
free_dentry_path(page);
cifs_put_tlink(tlink);
free_xid(xid);
return rc;

11
fs/cifs/readdir.c
View File

@ -942,13 +942,14 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
char *tmp_buf = NULL;
char *end_of_smb;
unsigned int max_len;
const char *full_path = NULL;
const char *full_path;
void *page = alloc_dentry_path();
xid = get_xid();
full_path = build_path_from_dentry(file_dentry(file));
if (full_path == NULL) {
rc = -ENOMEM;
full_path = build_path_from_dentry(file_dentry(file), page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto rddir2_exit;
}
@ -1043,7 +1044,7 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
kfree(tmp_buf);
rddir2_exit:
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
return rc;
}

17
fs/cifs/smb2ops.c
View File

@ -2217,20 +2217,21 @@ smb3_notify(const unsigned int xid, struct file *pfile,
struct smb3_notify notify;
struct dentry *dentry = pfile->f_path.dentry;
struct inode *inode = file_inode(pfile);
struct cifs_sb_info *cifs_sb;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_open_parms oparms;
struct cifs_fid fid;
struct cifs_tcon *tcon;
const unsigned char *path = NULL;
const unsigned char *path;
void *page = alloc_dentry_path();
__le16 *utf16_path = NULL;
u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
int rc = 0;
path = build_path_from_dentry(dentry);
if (path == NULL)
return -ENOMEM;
cifs_sb = CIFS_SB(inode->i_sb);
path = build_path_from_dentry(dentry, page);
if (IS_ERR(path)) {
rc = PTR_ERR(path);
goto notify_exit;
}
utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
if (utf16_path == NULL) {
@ -2264,7 +2265,7 @@ smb3_notify(const unsigned int xid, struct file *pfile,
cifs_dbg(FYI, "change notify for path %s rc %d\n", path, rc);
notify_exit:
kfree(path);
free_dentry_path(page);
kfree(utf16_path);
return rc;
}

30
fs/cifs/xattr.c
View File

@ -113,6 +113,7 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
const char *full_path;
void *page;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
@ -120,10 +121,11 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
pTcon = tlink_tcon(tlink);
xid = get_xid();
page = alloc_dentry_path();
full_path = build_path_from_dentry(dentry);
if (full_path == NULL) {
rc = -ENOMEM;
full_path = build_path_from_dentry(dentry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto out;
}
/* return dos attributes as pseudo xattr */
@ -235,7 +237,7 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
}
out:
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@ -298,6 +300,7 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
const char *full_path;
void *page;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
@ -305,10 +308,11 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
pTcon = tlink_tcon(tlink);
xid = get_xid();
page = alloc_dentry_path();
full_path = build_path_from_dentry(dentry);
if (full_path == NULL) {
rc = -ENOMEM;
full_path = build_path_from_dentry(dentry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto out;
}
@ -401,7 +405,7 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
rc = -EOPNOTSUPP;
out:
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@ -415,6 +419,7 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
const char *full_path;
void *page;
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
return -EOPNOTSUPP;
@ -425,10 +430,11 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
pTcon = tlink_tcon(tlink);
xid = get_xid();
page = alloc_dentry_path();
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
full_path = build_path_from_dentry(direntry, page);
if (IS_ERR(full_path)) {
rc = PTR_ERR(full_path);
goto list_ea_exit;
}
/* return dos attributes as pseudo xattr */
@ -442,7 +448,7 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
full_path, NULL, data, buf_size, cifs_sb);
list_ea_exit:
kfree(full_path);
free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;