linux-kernel - [PATCH 3.12 47/72] vxlan: fix potential NULL dereference in arp

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Date:	Fri, 18 Apr 2014 11:22:20 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, David Stevens <dlstevens@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 47/72] vxlan: fix potential NULL dereference in arp_reduce()

From: David Stevens <dlstevens@...ibm.com>

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

===============

[ Upstream commit 7346135dcd3f9b57f30a5512094848c678d7143e ]

This patch fixes a NULL pointer dereference in the event of an
skb allocation failure in arp_reduce().

Signed-Off-By: David L Stevens <dlstevens@...ibm.com>
Acked-by: Cong Wang <cwang@...pensource.com>

Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/net/vxlan.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 32c45c3d820d..020fe03f37c0 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1212,6 +1212,9 @@ static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
 
 		neigh_release(n);
 
+		if (reply == NULL)
+			goto out;
+
 		skb_reset_mac_header(reply);
 		__skb_pull(reply, skb_network_offset(reply));
 		reply->ip_summed = CHECKSUM_UNNECESSARY;
-- 
1.9.2

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