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f2fs crypto: fix corrupted symlink in encrypted case 

In the encrypted symlink case, we should check its corrupted symname after
decrypting it.
Otherwise, we can report -ENOENT incorrectly, if encrypted symname starts with
'\0'.

Cc: stable 4.5+ <stable@vger.kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2016-03-30 13:13:16 -07:00
parent fd694733d5
commit c90e09f7fb
1 changed files with 6 additions and 6 deletions
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12
fs/f2fs/namei.c
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@ -1027,12 +1027,6 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry,
goto errout;
}
/* this is broken symlink case */
if (unlikely(cstr.name[0] == 0)) {
res = -ENOENT;
goto errout;
}
if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
/* Symlink data on the disk is corrupted */
res = -EIO;
@ -1046,6 +1040,12 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry,
if (res < 0)
goto errout;
/* this is broken symlink case */
if (unlikely(pstr.name[0] == 0)) {
res = -ENOENT;
goto errout;
}
paddr = pstr.name;
/* Null-terminate the name */