From: Patrick McHardy <kaber@trash.net>
Date: Thu, 20 Nov 2008 12:07:14 +0000 (-0800)
Subject: pkt_sched: fix missing check for packet overrun in qdisc_dump_stab()
X-Git-Tag: v2.6.28-rc6~8^2~3
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?p=linux-2.6-omap-h63xx.git;a=commitdiff_plain;h=3aa4614da741f10b09559a5675c79e2eff5cccd8

pkt_sched: fix missing check for packet overrun in qdisc_dump_stab()

nla_nest_start() might return NULL, causing a NULL pointer dereference.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index b16ad2972c6..6ab4a2f92ca 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -417,6 +417,8 @@ static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
 	struct nlattr *nest;
 
 	nest = nla_nest_start(skb, TCA_STAB);
+	if (nest == NULL)
+		goto nla_put_failure;
 	NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts);
 	nla_nest_end(skb, nest);