The patch below does not apply to the 4.5-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From c90e09f7fb498f81cd4e8bb6460d3a26ccebeca3 Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Date: Wed, 30 Mar 2016 13:13:16 -0700
Subject: [PATCH] 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@xxxxxxxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 7876f1052101..6214d9ec89f2 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 */
--
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