From: Linus Lüssing Date: Tue, 22 Mar 2011 11:40:32 +0000 (+0000) Subject: bridge: Fix possibly wrong MLD queries' ethernet source address X-Git-Tag: v2.6.39-rc1~9^2~63 X-Git-Url: http://git.cascardo.eti.br/?a=commitdiff_plain;ds=sidebyside;h=a7bff75b087e7a355838a32efe61707cfa73c194;p=cascardo%2Flinux.git bridge: Fix possibly wrong MLD queries' ethernet source address The ipv6_dev_get_saddr() is currently called with an uninitialized destination address. Although in tests it usually seemed to nevertheless always fetch the right source address, there seems to be a possible race condition. Therefore this commit changes this, first setting the destination address and only after that fetching the source address. Reported-by: Jan Beulich Signed-off-by: Linus Lüssing Signed-off-by: David S. Miller --- diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index 030a002ff8ee..f61eb2eff3fd 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -445,9 +445,9 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, ip6h->payload_len = htons(8 + sizeof(*mldq)); 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); - ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); hopopt = (u8 *)(ip6h + 1);