Commit 91bc033c authored Apr 30, 2013 by stephen hemminger Committed by David S. Miller Apr 30, 2013

bridge: avoid OOPS if root port not found

Bridge can crash while trying to send topology change packet.
This happens if root port can't be found. This was reported by user
but currently unable to reproduce it easily. The STP conditions that cause
this are not known yet, but the problem doesn't have to be fatal.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 7dcf313a

net/bridge/br_stp.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -225,7 +225,14 @@ static void br_record_config_timeout_values(struct net_bridge *br,
		/* called under bridge lock */
		void br_transmit_tcn(struct net_bridge *br)
		{
		br_send_tcn_bpdu(br_get_port(br, br->root_port));
		struct net_bridge_port *p;

		p = br_get_port(br, br->root_port);
		if (p)
		br_send_tcn_bpdu(p);
		else
		br_notice(br, "root port %u not found for topology notice\n",
		br->root_port);
		}

		/* called under bridge lock */