net: bridge: mcast: fix stale ipv6 hdr pointer when handling v6 query

[ Upstream commit 3b26a5d03d35d8f732d75951218983c0f7f68dff ]

We get a pointer to the ipv6 hdr in br_ip6_multicast_query but we may
call pskb_may_pull afterwards and end up using a stale pointer.
So use the header directly, it's just 1 place where it's needed.

Fixes: 08b202b67264 ("bridge br_multicast: IPv6 MLD support.")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Tested-by: Martin Weinelt <martin@linuxlounge.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 805d8e52d20b6931df6286f93efdcedf097f369b..0ef4092202d05e817c3a2914e9cc81754f001604 100644 (file)
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1302,7 +1302,6 @@ static int br_ip6_multicast_query(struct net_bridge *br,
                                  u16 vid)
 {
        unsigned int transport_len = ipv6_transport_len(skb);
-       const struct ipv6hdr *ip6h = ipv6_hdr(skb);
        struct mld_msg *mld;
        struct net_bridge_mdb_entry *mp;
        struct mld2_query *mld2q;
@@ -1346,7 +1345,7 @@ static int br_ip6_multicast_query(struct net_bridge *br,
 
        if (is_general_query) {
                saddr.proto = htons(ETH_P_IPV6);
-               saddr.u.ip6 = ip6h->saddr;
+               saddr.u.ip6 = ipv6_hdr(skb)->saddr;
 
                br_multicast_query_received(br, port, &br->ip6_other_query,
                                            &saddr, max_delay);