Subject: [PATCH][MCAST]IPv6: Check packet size when process Multicast Address and Source Specific Query

From: Yan Zheng <[email-masked]>
Date: Mon, 31 Oct 2005 13:20:21 +0800

Signed-off-by: Yan Zheng <[email-masked]>

Index: net/ipv6/mcast.c
================================================================================
--- linux-2.6.14/net/ipv6/mcast.c	2005-10-30 23:09:33.000000000 +0800
+++ linux/net/ipv6/mcast.c	2005-10-31 13:13:10.000000000 +0800
@@ -1156,7 +1156,12 @@ int igmp6_event_query(struct sk_buff *sk
 			return 0;
 		}
 		/* mark sources to include, if group & source-specific */
-		mark = mlh2->nsrcs != 0;
+		if (mlh2->nsrcs != 0) {
+			if (!pskb_may_pull(skb, mlh2->nsrcs * sizeof(struct in6_addr) +
+				(sizeof(struct mld2_query) - sizeof(struct icmp6hdr))))
+				return -EINVAL;
+			mark = 1;
+		}
 	} else {
 		in6_dev_put(idev);
 		return -EINVAL;