vhost: fix error handling in RESET_OWNER ioctl
RESET_OWNER ioctl would leave the fd in a bad state if
memory allocation failed: device is stopped
but owner is not reset. Make state changes
after allocating memory, such that a failed
ioctl has no effect.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index e34e195..a3645bd 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -967,14 +967,20 @@
struct socket *tx_sock = NULL;
struct socket *rx_sock = NULL;
long err;
+ struct vhost_memory *memory;
mutex_lock(&n->dev.mutex);
err = vhost_dev_check_owner(&n->dev);
if (err)
goto done;
+ memory = vhost_dev_reset_owner_prepare();
+ if (!memory) {
+ err = -ENOMEM;
+ goto done;
+ }
vhost_net_stop(n, &tx_sock, &rx_sock);
vhost_net_flush(n);
- err = vhost_dev_reset_owner(&n->dev);
+ vhost_dev_reset_owner(&n->dev, memory);
vhost_net_vq_reset(n);
done:
mutex_unlock(&n->dev.mutex);
