bridge: Fix IGMP3 report parsing

The IGMP3 report parsing is looking at the wrong address for
group records.  This patch fixes it.

Reported-by: Banyeer <banyeer@yahoo.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 6980625537caa15e5f0a479eccca15c3341073a3..f29ada827a6acfe04afd7e3752724013ac58c27f 100644 (file)
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -723,7 +723,7 @@ static int br_multicast_igmp3_report(struct net_bridge *br,
                if (!pskb_may_pull(skb, len))
                        return -EINVAL;
 
-               grec = (void *)(skb->data + len);
+               grec = (void *)(skb->data + len - sizeof(*grec));
                group = grec->grec_mca;
                type = grec->grec_type;