提交 000b7287 编写于 作者: N Nikolay Aleksandrov 提交者: David S. Miller

net: bridge: multicast: fix MRD advertisement router port marking race

When an MRD advertisement is received on a bridge port with multicast
snooping enabled, we mark it as a router port automatically, that
includes adding that port to the router port list. The multicast lock
protects that list, but it is not acquired in the MRD advertisement case
leading to a race condition, we need to take it to fix the race.

Cc: stable@vger.kernel.org
Cc: linus.luessing@c0d3.blue
Fixes: 4b3087c7 ("bridge: Snoop Multicast Router Advertisements")
Signed-off-by: NNikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 04bef83a
无相关合并请求
......@@ -3277,7 +3277,9 @@ static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
return -ENOMSG;
spin_lock(&br->multicast_lock);
br_ip4_multicast_mark_router(br, port);
spin_unlock(&br->multicast_lock);
return 0;
}
......@@ -3345,7 +3347,9 @@ static void br_ip6_multicast_mrd_rcv(struct net_bridge *br,
if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
return;
spin_lock(&br->multicast_lock);
br_ip6_multicast_mark_router(br, port);
spin_unlock(&br->multicast_lock);
}
static int br_multicast_ipv6_rcv(struct net_bridge *br,
......
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