netdev - [PATCH v2 3/4] cls_rsvp: add sanity check for the packet length

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Date:	Wed,  4 Aug 2010 22:55:40 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Jamal Hadi Salim <hadi@...erus.ca>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Changli Gao <xiaosuo@...il.com>
Subject: [PATCH v2 3/4] cls_rsvp: add sanity check for the packet length

The packet length should be checked before the packet data is dereferenced.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
---
v2: use pskb_network_may_pull()
 net/sched/cls_rsvp.h |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/net/sched/cls_rsvp.h b/net/sched/cls_rsvp.h
index dd9414e..425a179 100644
--- a/net/sched/cls_rsvp.h
+++ b/net/sched/cls_rsvp.h
@@ -143,9 +143,17 @@ static int rsvp_classify(struct sk_buff *skb, struct tcf_proto *tp,
 	u8 tunnelid = 0;
 	u8 *xprt;
 #if RSVP_DST_LEN == 4
-	struct ipv6hdr *nhptr = ipv6_hdr(skb);
+	struct ipv6hdr *nhptr;
+
+	if (!pskb_network_may_pull(skb, sizeof(*nhptr)))
+		return -1;
+	nhptr = ipv6_hdr(skb);
 #else
-	struct iphdr *nhptr = ip_hdr(skb);
+	struct iphdr *nhptr;
+
+	if (!pskb_network_may_pull(skb, sizeof(*nhptr)))
+		return -1;
+	nhptr = ip_hdr(skb);
 #endif
 
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