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authorNikolay Aleksandrov <nikolay@cumulusnetworks.com>2019-04-11 15:08:25 +0300
committerDavid S. Miller <davem@davemloft.net>2019-04-11 11:13:51 -0700
commitc5b493ce192bd7a4e7bd073b5685aad121eeef82 (patch)
tree8681dcc4d5fb2a31d72d5c3a5f3f5ba9b8a8a757 /net
parent9a4dda81f1d377ff98e82f019e07a6f2a1db34f3 (diff)
downloadlinux-c5b493ce192bd7a4e7bd073b5685aad121eeef82.tar.bz2
net: bridge: multicast: use rcu to access port list from br_multicast_start_querier
br_multicast_start_querier() walks over the port list but it can be called from a timer with only multicast_lock held which doesn't protect the port list, so use RCU to walk over it. Fixes: c83b8fab06fc ("bridge: Restart queries when last querier expires") Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_multicast.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 02da21d771c9..45e7f4173bba 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -2031,7 +2031,8 @@ static void br_multicast_start_querier(struct net_bridge *br,
__br_multicast_open(br, query);
- list_for_each_entry(port, &br->port_list, list) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(port, &br->port_list, list) {
if (port->state == BR_STATE_DISABLED ||
port->state == BR_STATE_BLOCKING)
continue;
@@ -2043,6 +2044,7 @@ static void br_multicast_start_querier(struct net_bridge *br,
br_multicast_enable(&port->ip6_own_query);
#endif
}
+ rcu_read_unlock();
}
int br_multicast_toggle(struct net_bridge *br, unsigned long val)