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f2fs: early check broken symlink length in the encrypted case

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If link is broken, its len is zero, and we don't need to move forward.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-12-24 16:13:09 -08:00
parent e96248bb45
commit 8dc0d6a11e
1 changed files with 8 additions and 2 deletions
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10
fs/f2fs/namei.c
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@ -931,7 +931,7 @@ static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cook
{
struct page *cpage = NULL;
char *caddr, *paddr = NULL;
struct f2fs_str cstr;
struct f2fs_str cstr = FSTR_INIT(NULL, 0);
struct f2fs_str pstr = FSTR_INIT(NULL, 0);
struct inode *inode = d_inode(dentry);
struct f2fs_encrypted_symlink_data *sd;
@ -952,6 +952,12 @@ static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cook
/* Symlink is encrypted */
sd = (struct f2fs_encrypted_symlink_data *)caddr;
cstr.len = le16_to_cpu(sd->len);
/* this is broken symlink case */
if (unlikely(cstr.len == 0)) {
res = -ENOENT;
goto errout;
}
cstr.name = kmalloc(cstr.len, GFP_NOFS);
if (!cstr.name) {
res = -ENOMEM;
@ -960,7 +966,7 @@ static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cook
memcpy(cstr.name, sd->encrypted_path, cstr.len);
/* this is broken symlink case */
if (cstr.name[0] == 0 && cstr.len == 0) {
if (unlikely(cstr.name[0] == 0)) {
res = -ENOENT;
goto errout;
}