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two cifs/smb3 fixes, one fscache related, and one mount parsing related for stable

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Merge tag '5.16-rc5-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
 "Two cifs/smb3 fixes, one fscache related, and one mount parsing
  related for stable"

* tag '5.16-rc5-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: sanitize multiple delimiters in prepath
  cifs: ignore resource_id while getting fscache super cookie
This commit is contained in:
Linus Torvalds 2021-12-19 11:23:02 -08:00
commit 9273d6cb99
3 changed files with 44 additions and 14 deletions
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7
fs/cifs/connect.c
View File

@ -3064,6 +3064,13 @@ static int mount_get_conns(struct mount_ctx *mnt_ctx)
(cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
/*
* The cookie is initialized from volume info returned above.
* Inside cifs_fscache_get_super_cookie it checks
* that we do not get super cookie twice.
*/
cifs_fscache_get_super_cookie(tcon);
out:
mnt_ctx->server = server;
mnt_ctx->ses = ses;

38
fs/cifs/fs_context.c
View File

@ -434,6 +434,42 @@ out:
return rc;
}
/*
* Remove duplicate path delimiters. Windows is supposed to do that
* but there are some bugs that prevent rename from working if there are
* multiple delimiters.
*
* Returns a sanitized duplicate of @path. The caller is responsible for
* cleaning up the original.
*/
#define IS_DELIM(c) ((c) == '/' || (c) == '\\')
static char *sanitize_path(char *path)
{
char *cursor1 = path, *cursor2 = path;
/* skip all prepended delimiters */
while (IS_DELIM(*cursor1))
cursor1++;
/* copy the first letter */
*cursor2 = *cursor1;
/* copy the remainder... */
while (*(cursor1++)) {
/* ... skipping all duplicated delimiters */
if (IS_DELIM(*cursor1) && IS_DELIM(*cursor2))
continue;
*(++cursor2) = *cursor1;
}
/* if the last character is a delimiter, skip it */
if (IS_DELIM(*(cursor2 - 1)))
cursor2--;
*(cursor2) = '\0';
return kstrdup(path, GFP_KERNEL);
}
/*
* Parse a devname into substrings and populate the ctx->UNC and ctx->prepath
* fields with the result. Returns 0 on success and an error otherwise
@ -493,7 +529,7 @@ smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx)
if (!*pos)
return 0;
ctx->prepath = kstrdup(pos, GFP_KERNEL);
ctx->prepath = sanitize_path(pos);
if (!ctx->prepath)
return -ENOMEM;

13
fs/cifs/inode.c
View File

@ -1356,11 +1356,6 @@ iget_no_retry:
goto out;
}
#ifdef CONFIG_CIFS_FSCACHE
/* populate tcon->resource_id */
tcon->resource_id = CIFS_I(inode)->uniqueid;
#endif
if (rc && tcon->pipe) {
cifs_dbg(FYI, "ipc connection - fake read inode\n");
spin_lock(&inode->i_lock);
@ -1375,14 +1370,6 @@ iget_no_retry:
iget_failed(inode);
inode = ERR_PTR(rc);
}
/*
* The cookie is initialized from volume info returned above.
* Inside cifs_fscache_get_super_cookie it checks
* that we do not get super cookie twice.
*/
cifs_fscache_get_super_cookie(tcon);
out:
kfree(path);
free_xid(xid);