virtio-net: only delete bh that existed
We delete without check whether it existed during exit. This will lead NULL pointer deference since it was created conditionally depends on guest driver status and features. So add a check of existence before trying to delete it. Cc: qemu-stable@nongnu.org Signed-off-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -1601,7 +1601,7 @@ static int virtio_net_device_exit(DeviceState *qdev)
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if (q->tx_timer) {
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timer_del(q->tx_timer);
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timer_free(q->tx_timer);
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} else {
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} else if (q->tx_bh) {
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qemu_bh_delete(q->tx_bh);
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}
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}
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