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Subject[PATCH] f2fs crypto: fix corrupted symlink in encrypted case
Date
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>
---
fs/f2fs/namei.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 7876f10..6214d9e 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -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 */
--
2.6.3
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