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do not call vhost_net_cleanup() on running net from char user event

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Buglink: https://launchpad.net/bugs/1823458

Currently, a user CHR_EVENT_CLOSED event will cause net_vhost_user_event()
to call vhost_user_cleanup(), which calls vhost_net_cleanup() for all
its queues.  However, vhost_net_cleanup() must never be called like
this for fully-initialized nets; when other code later calls
vhost_net_stop() - such as from virtio_net_vhost_status() - it will try
to access the already-cleaned-up fields and fail with assertion errors
or segfaults.

The vhost_net_cleanup() will eventually be called from
qemu_cleanup_net_client().

Signed-off-by: Dan Streetman <ddstreet@canonical.com>
Message-Id: <20190416184624.15397-3-dan.streetman@canonical.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dan Streetman 2019-04-16 14:46:24 -04:00 committed by Michael S. Tsirkin
parent fe4970ad46
commit 6ab79a20af
1 changed files with 0 additions and 1 deletions
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1
net/vhost-user.c
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@ -236,7 +236,6 @@ static void chr_closed_bh(void *opaque)
s = DO_UPCAST(NetVhostUserState, nc, ncs[0]);
qmp_set_link(name, false, &err);
vhost_user_stop(queues, ncs);
qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, net_vhost_user_event,
NULL, opaque, NULL, true);