bridge: check return value of ipv6_dev_get_saddr()
otherwise source IPv6 address of ICMPV6_MGM_QUERY packet
might be random junk if IPv6 is disabled on interface or
link-local address is not yet ready (DAD).
Signed-off-by: Ulrich Weber <ulrich.weber@sophos.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 568d5bf..702a1ae 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -446,8 +446,11 @@
ip6h->nexthdr = IPPROTO_HOPOPTS;
ip6h->hop_limit = 1;
ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
- ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
- &ip6h->saddr);
+ if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
+ &ip6h->saddr)) {
+ kfree_skb(skb);
+ return NULL;
+ }
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
hopopt = (u8 *)(ip6h + 1);