netdev - [GIT PULL 2/2] ipvs: ip_vs_sh: ip_vs_sh_get_port: check skb_header

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Date:	Wed,  7 Aug 2013 17:40:29 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	Wensong Zhang <wensong@...ux-vs.org>,
	Julian Anastasov <ja@....bg>,
	Daniel Borkmann <dborkman@...hat.com>,
	Simon Horman <horms@...ge.net.au>
Subject: [GIT PULL 2/2] ipvs: ip_vs_sh: ip_vs_sh_get_port: check skb_header_pointer for NULL

From: Daniel Borkmann <dborkman@...hat.com>

skb_header_pointer could return NULL, so check for it as we do it
everywhere else in ipvs code. This fixes a coverity warning.

Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
Acked-by: Julian Anastasov <ja@....bg>
Signed-off-by: Simon Horman <horms@...ge.net.au>
---
 net/netfilter/ipvs/ip_vs_sh.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/netfilter/ipvs/ip_vs_sh.c b/net/netfilter/ipvs/ip_vs_sh.c
index f16c027..3588fae 100644
--- a/net/netfilter/ipvs/ip_vs_sh.c
+++ b/net/netfilter/ipvs/ip_vs_sh.c
@@ -269,14 +269,20 @@ ip_vs_sh_get_port(const struct sk_buff *skb, struct ip_vs_iphdr *iph)
 	switch (iph->protocol) {
 	case IPPROTO_TCP:
 		th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph);
+		if (unlikely(th == NULL))
+			return 0;
 		port = th->source;
 		break;
 	case IPPROTO_UDP:
 		uh = skb_header_pointer(skb, iph->len, sizeof(_udph), &_udph);
+		if (unlikely(uh == NULL))
+			return 0;
 		port = uh->source;
 		break;
 	case IPPROTO_SCTP:
 		sh = skb_header_pointer(skb, iph->len, sizeof(_sctph), &_sctph);
+		if (unlikely(sh == NULL))
+			return 0;
 		port = sh->source;
 		break;
 	default:
-- 
1.8.3.2

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