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author | Nikolay Aleksandrov <nikolay@nvidia.com> | 2021-07-11 12:56:28 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-20 16:16:15 +0200 |
commit | 2e70bf39b1a96b40ab13044729613a913b46cddd (patch) | |
tree | 6116afd3e68bdc17bdcba11dbc8689820c5e4b5d /net/bridge | |
parent | 8553099bdbe95a717e974552b6e6dbb8c4dac70b (diff) | |
download | linux-stable-2e70bf39b1a96b40ab13044729613a913b46cddd.tar.gz linux-stable-2e70bf39b1a96b40ab13044729613a913b46cddd.tar.bz2 linux-stable-2e70bf39b1a96b40ab13044729613a913b46cddd.zip |
net: bridge: multicast: fix PIM hello router port marking race
commit 04bef83a3358946bfc98a5ecebd1b0003d83d882 upstream.
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: 91b02d3d133b ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/bridge')
-rw-r--r-- | net/bridge/br_multicast.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index 6a362da211e1..3504c3acd38f 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -1791,7 +1791,9 @@ static void br_multicast_pim(struct net_bridge *br, pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) return; + spin_lock(&br->multicast_lock); br_multicast_mark_router(br, port); + spin_unlock(&br->multicast_lock); } static int br_multicast_ipv4_rcv(struct net_bridge *br, |