Re: [Qemu-devel] [PATCH 2/2] vhost-user: unregister slave req handler at cleanup time

["Marc-André Lureau" <marcandre.lureau@redhat.com>]

----- Original Message -----
> If the backend sends a request just before closing the socket,
> the aio dispatcher might schedule its reading after the vhost
> device has been cleaned, leading to a NULL pointer dereference
> in slave_read();
> 
> vhost_user_cleanup() already closes the socket but it is not
> enough, the handler has to be unregistered.
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>


> ---
>  hw/virtio/vhost-user.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
> index 958ee09..2203011 100644
> --- a/hw/virtio/vhost-user.c
> +++ b/hw/virtio/vhost-user.c
> @@ -779,6 +779,7 @@ static int vhost_user_cleanup(struct vhost_dev *dev)
>  
>      u = dev->opaque;
>      if (u->slave_fd >= 0) {
> +        qemu_set_fd_handler(u->slave_fd, NULL, NULL, NULL);
>          close(u->slave_fd);
>          u->slave_fd = -1;
>      }
> --
> 2.9.4
> 
>