linux-kernel - [PATCH 3.16.y-ckt 155/183] GFS2: Fix crash during ACL deletion in acl max entry check in gfs2_set

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Message-Id: <1425635874-19087-156-git-send-email-luis.henriques@canonical.com>
Date:	Fri,  6 Mar 2015 09:57:26 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Andrew Elble <aweits@....edu>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 155/183] GFS2: Fix crash during ACL deletion in acl max entry check in gfs2_set_acl()

3.16.7-ckt8 -stable review patch.  If anyone has any objections, please let me know.

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

From: Andrew Elble <aweits@....edu>

commit 278702074ff77b1a3fa2061267997095959f5e2c upstream.

Fixes: e01580bf9e ("gfs2: use generic posix ACL infrastructure")
Reported-by: Eric Meddaugh <etmsys@....edu>
Tested-by: Eric Meddaugh <etmsys@....edu>
Signed-off-by: Andrew Elble <aweits@....edu>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/gfs2/acl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index 3088e2a38e30..7b3143064af1 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -73,7 +73,7 @@ int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 
 	BUG_ON(name == NULL);
 
-	if (acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
+	if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
 		return -E2BIG;
 
 	if (type == ACL_TYPE_ACCESS) {
--
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