linux-kernel - [PATCH 3.16 022/294] libceph: potential NULL dereference in ceph_msg_data

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Date:   Mon, 06 Nov 2017 23:03:02 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        "Ilya Dryomov" <idryomov@...il.com>
Subject: [PATCH 3.16 022/294] libceph: potential NULL dereference in
 ceph_msg_data_create()

3.16.50-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 7c40b22f6f84c98a1d36e6d0a4346e58f05e45d8 upstream.

If kmem_cache_zalloc() returns NULL then the INIT_LIST_HEAD(&data->links);
will Oops.  The callers aren't really prepared for NULL returns so it
doesn't make a lot of difference in real life.

Fixes: 5240d9f95dfe ("libceph: replace message data pointer with list")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/ceph/messenger.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -3075,8 +3075,10 @@ static struct ceph_msg_data *ceph_msg_da
 		return NULL;
 
 	data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS);
-	if (data)
-		data->type = type;
+	if (!data)
+		return NULL;
+
+	data->type = type;
 	INIT_LIST_HEAD(&data->links);
 
 	return data;