linux-kernel - [PATCH 4.2.y-ckt 132/305] ext4: fix an endianness bug in ext4_encrypted_follow

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Message-Id: <1452902519-2754-133-git-send-email-kamal@canonical.com>
Date:	Fri, 15 Jan 2016 15:59:06 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Al Viro <viro@...iv.linux.org.uk>, Theodore Ts'o <tytso@....edu>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 132/305] ext4: fix an endianness bug in ext4_encrypted_follow_link()

4.2.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Al Viro <viro@...IV.linux.org.uk>

commit 5a1c7f47da9b32d0671e776b0f388095b7f91e2e upstream.

applying le32_to_cpu() to 16bit value is a bad idea...

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 fs/ext4/symlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index c677f2c..3627fd7 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -52,7 +52,7 @@ static const char *ext4_encrypted_follow_link(struct dentry *dentry, void **cook
 	/* Symlink is encrypted */
 	sd = (struct ext4_encrypted_symlink_data *)caddr;
 	cstr.name = sd->encrypted_path;
-	cstr.len  = le32_to_cpu(sd->len);
+	cstr.len  = le16_to_cpu(sd->len);
 	if ((cstr.len +
 	     sizeof(struct ext4_encrypted_symlink_data) - 1) >
 	    max_size) {
-- 
1.9.1