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bridge: avoid OOPS if root port not found

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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>
This commit is contained in:
stephen hemminger 2013-04-30 05:29:27 +00:00 committed by David S. Miller
parent 7dcf313a7a
commit 91bc033c4d
1 changed files with 8 additions and 1 deletions
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9
net/bridge/br_stp.c
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@ -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 */