ocfs2: Don't walk off the end of fast symlinks.
authorJoel Becker <joel.becker@oracle.com>
Thu, 30 Sep 2010 00:33:05 +0000 (17:33 -0700)
committerJoel Becker <joel.becker@oracle.com>
Thu, 30 Sep 2010 00:33:05 +0000 (17:33 -0700)
commit1fc8a117865b54590acd773a55fbac9221b018f0
treeb086c52bcc77ab3816653719f0c6ad4e33c5c74c
parent899611ee7d373e5eeda08e9a8632684e1ebbbf00
ocfs2: Don't walk off the end of fast symlinks.

ocfs2 fast symlinks are NUL terminated strings stored inline in the
inode data area.  However, disk corruption or a local attacker could, in
theory, remove that NUL.  Because we're using strlen() (my fault,
introduced in a731d1 when removing vfs_follow_link()), we could walk off
the end of that string.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Cc: stable@kernel.org
fs/ocfs2/symlink.c