From d3337de52af7fb0ebe605b02b740be4ee7dee9eb Mon Sep 17 00:00:00 2001
From: Jesper Juhl <jj@chaosbits.net>
Date: Thu, 10 Feb 2011 11:57:16 +0000
Subject: [PATCH] Don't potentially dereference NULL in
 net/dcb/dcbnl.c:dcbnl_getapp()

nla_nest_start() may return NULL. If it does then we'll blow up in
nla_nest_end() when we dereference the pointer.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/dcb/dcbnl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 712ca026040a..d5074a567289 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -626,6 +626,9 @@ static int dcbnl_getapp(struct net_device *netdev, struct nlattr **tb,
 	dcb->cmd = DCB_CMD_GAPP;
 
 	app_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_APP);
+	if (!app_nest)
+		goto out_cancel;
+
 	ret = nla_put_u8(dcbnl_skb, DCB_APP_ATTR_IDTYPE, idtype);
 	if (ret)
 		goto out_cancel;
-- 
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