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net: bridge: multicast: fix PIM hello router port marking race

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

Cc: stable@vger.kernel.org
Fixes: 91b02d3d13 ("bridge: mcast: add router port on PIM hello message")
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2021-07-11 12:56:28 +03:00 committed by David S. Miller
parent a5de4be0aa
commit 04bef83a33
1 changed files with 2 additions and 0 deletions
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2
net/bridge/br_multicast.c
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@ -3264,7 +3264,9 @@ static void br_multicast_pim(struct net_bridge *br,
pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
return;
spin_lock(&br->multicast_lock);
br_ip4_multicast_mark_router(br, port);
spin_unlock(&br->multicast_lock);
}
static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,