From: Nikolay Aleksandrov <nikolay@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Fixes: 91b02d3d133b ("bridge: mcast: add router port on PIM hello message")
Signed-off-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxx>
---
net/bridge/br_multicast.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 53c3a9d80d9c..3bbbc6d7b7c3 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -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,
--
2.31.1
