linux-kernel - [42/42] xfs: fix acl count validation in xfs_acl_from

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Date:	Tue, 10 Jan 2012 13:48:52 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Xi Wang <xi.wang@...il.com>,
	Ben Myers <bpm@....com>
Subject: [42/42] xfs: fix acl count validation in xfs_acl_from_disk()

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

------------------

From: Xi Wang <xi.wang@...il.com>

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@...il.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Ben Myers <bpm@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/xfs/xfs_acl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/xfs/xfs_acl.c
+++ b/fs/xfs/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)


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