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[Xen-devel] [PATCH] xenpaging: fix crash in notify_via_xen_event_channel
| To: | Patrick Colp <pjcolp@xxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] xenpaging: fix crash in notify_via_xen_event_channel |
| From: | Olaf Hering <olaf@xxxxxxxxx> |
| Date: | Wed, 15 Sep 2010 18:11:46 +0200 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Wed, 15 Sep 2010 09:12:41 -0700 |
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| User-agent: | Mutt/1.5.20 (2009-06-14) |
Avoid crash of Xen if a xenpaging enabled guest crashes and there are still memevents in flight, as reported here: http://lists.xensource.com/archives/html/xen-devel/2010-08/msg00516.html Signed-off-by: Olaf Hering <olaf@xxxxxxxxx> --- xen/common/event_channel.c | 6 ++++++ 1 file changed, 6 insertions(+) --- xen-unstable.hg-4.1.22132.orig/xen/common/event_channel.c +++ xen-unstable.hg-4.1.22132/xen/common/event_channel.c @@ -1030,6 +1030,12 @@ void notify_via_xen_event_channel(struct spin_lock(&ld->event_lock); + if ( unlikely(ld->is_dying) ) + { + spin_unlock(&ld->event_lock); + return; + } + ASSERT(port_is_valid(ld, lport)); lchn = evtchn_from_port(ld, lport); ASSERT(lchn->consumer_is_xen); _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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