From: Xi Wang <xi.wang@gmail.com>
Date: Mon, 12 Dec 2011 21:55:52 +0000 (+0000)
Subject: xfs: fix acl count validation in xfs_acl_from_disk()
X-Git-Tag: 2.1b_release~40
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ed99ae3afcee212b8cb9ad21253ca88d176a876a;p=platform%2Fkernel%2Fkernel-mfld-blackbay.git

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>
---

diff --git a/fs/xfs/linux-2.6/xfs_acl.c b/fs/xfs/linux-2.6/xfs_acl.c
index 4b9fb91..f86e034 100644
--- a/fs/xfs/linux-2.6/xfs_acl.c
+++ b/fs/xfs/linux-2.6/xfs_acl.c
@@ -39,7 +39,7 @@ xfs_acl_from_disk(struct xfs_acl *aclp)
 	struct posix_acl_entry *acl_e;
 	struct posix_acl *acl;
 	struct xfs_acl_entry *ace;
-	int count, i;
+	unsigned int count, i;
 
 	count = be32_to_cpu(aclp->acl_cnt);
 	if (count > XFS_ACL_MAX_ENTRIES)