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vhost: check for vhost_ops before using.

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'vhost_set_vring_enable()' tries to call function using pointer to
'vhost_ops' which can be already zeroized in 'vhost_dev_cleanup()'
while vhost disconnection.

Fix that by checking 'vhost_ops' before using. This fixes QEMU crash
on calling 'ethtool -L eth0 combined 2' if vhost disconnected.

Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Ilya Maximets 2016-08-03 08:22:49 +03:00 committed by Michael S. Tsirkin
parent 53279c76cf
commit ca10203cde
1 changed files with 1 additions and 1 deletions
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2
hw/net/vhost_net.c
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@ -428,7 +428,7 @@ int vhost_set_vring_enable(NetClientState *nc, int enable)
nc->vring_enable = enable;
if (vhost_ops->vhost_set_vring_enable) {
if (vhost_ops && vhost_ops->vhost_set_vring_enable) {
return vhost_ops->vhost_set_vring_enable(&net->dev, enable);
}