Re: [PATCH] vhost/vsock: don't check owner in vhost_vsock_stop() while releasing

[Dan Carpenter]

Hi Stefano,

url:    https://github.com/0day-ci/linux/commits/Stefano-Garzarella/vhost-vsock-don-t-check-owner-in-vhost_vsock_stop-while-releasing/20220221-195038
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
config: x86_64-randconfig-m031-20220221 (https://download.01.org/0day-ci/archive/20220222/202202220707.AM3rKUcP-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

smatch warnings:
drivers/vhost/vsock.c:655 vhost_vsock_stop() error: uninitialized symbol 'ret'.

vim +/ret +655 drivers/vhost/vsock.c

3ace84c91bfcde Stefano Garzarella 2022-02-21  632  static int vhost_vsock_stop(struct vhost_vsock *vsock, bool check_owner)
433fc58e6bf2c8 Asias He           2016-07-28  633  {
433fc58e6bf2c8 Asias He           2016-07-28  634  	size_t i;
433fc58e6bf2c8 Asias He           2016-07-28  635  	int ret;
433fc58e6bf2c8 Asias He           2016-07-28  636  
433fc58e6bf2c8 Asias He           2016-07-28  637  	mutex_lock(&vsock->dev.mutex);
433fc58e6bf2c8 Asias He           2016-07-28  638  
3ace84c91bfcde Stefano Garzarella 2022-02-21  639  	if (check_owner) {
433fc58e6bf2c8 Asias He           2016-07-28  640  		ret = vhost_dev_check_owner(&vsock->dev);
433fc58e6bf2c8 Asias He           2016-07-28  641  		if (ret)
433fc58e6bf2c8 Asias He           2016-07-28  642  			goto err;
3ace84c91bfcde Stefano Garzarella 2022-02-21  643  	}

"ret" not initialized on else path.

433fc58e6bf2c8 Asias He           2016-07-28  644  
433fc58e6bf2c8 Asias He           2016-07-28  645  	for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
433fc58e6bf2c8 Asias He           2016-07-28  646  		struct vhost_virtqueue *vq = &vsock->vqs[i];
433fc58e6bf2c8 Asias He           2016-07-28  647  
433fc58e6bf2c8 Asias He           2016-07-28  648  		mutex_lock(&vq->mutex);
247643f85782fc Eugenio Pérez      2020-03-31  649  		vhost_vq_set_backend(vq, NULL);
433fc58e6bf2c8 Asias He           2016-07-28  650  		mutex_unlock(&vq->mutex);
433fc58e6bf2c8 Asias He           2016-07-28  651  	}
433fc58e6bf2c8 Asias He           2016-07-28  652  
433fc58e6bf2c8 Asias He           2016-07-28  653  err:
433fc58e6bf2c8 Asias He           2016-07-28  654  	mutex_unlock(&vsock->dev.mutex);
433fc58e6bf2c8 Asias He           2016-07-28 @655  	return ret;
433fc58e6bf2c8 Asias He           2016-07-28  656  }

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