xfs: fix acl count validation in xfs_acl_from_disk()
commit3c7af5a9c728fca26e90b7b58d1deb7ce4e59b45
authorXi Wang <xi.wang@gmail.com>
Mon, 12 Dec 2011 21:55:52 +0000 (12 21:55 +0000)
committerGreg Kroah-Hartman <gregkh@suse.de>
Thu, 12 Jan 2012 19:40:13 +0000 (12 11:40 -0800)
treee197c8677161e040e537ac2d247190de6c9f0a0b
parent9ee3e4ab17e3670a46b24502394eb24d68a85f9b
xfs: fix acl count validation in xfs_acl_from_disk()

commit 093019cf1b18dd31b2c3b77acce4e000e2cbc9ce upstream.

Commit fa8b18ed didn't prevent the integer overflow and possible
memory corruption.  "count" can go negative and bypass the check.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
fs/xfs/linux-2.6/xfs_acl.c