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Fix a panic when tearing down a vnet on a VIMAGE-enabled kernel.

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There was a race that bridge_ifdetach() could be called via
ifnet_departure event handler after vnet_bridge_uninit().

PR:		195859
Reported by:	Danilo Egea Gondolfo
This commit is contained in:
hrs 2015-02-14 18:15:14 +00:00
parent 9b83a1eb03
commit aae7e542bc
1 changed files with 9 additions and 2 deletions
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11
sys/net/if_bridge.c
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@ -228,7 +228,7 @@ struct bridge_softc {
static VNET_DEFINE(struct mtx, bridge_list_mtx);
#define V_bridge_list_mtx VNET(bridge_list_mtx)
eventhandler_tag bridge_detach_cookie = NULL;
static eventhandler_tag bridge_detach_cookie;
int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
@ -538,6 +538,7 @@ vnet_bridge_uninit(const void *unused __unused)
{
if_clone_detach(V_bridge_cloner);
V_bridge_cloner = NULL;
BRIDGE_LIST_LOCK_DESTROY();
}
VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
@ -1797,7 +1798,13 @@ bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
if (ifp->if_flags & IFF_RENAMING)
return;
if (V_bridge_cloner == NULL) {
/*
* This detach handler can be called after
* vnet_bridge_uninit(). Just return in that case.
*/
return;
}
/* Check if the interface is a bridge member */
if (sc != NULL) {
BRIDGE_LOCK(sc);