Re: [PATCH v2 1/6] vhost-user-blk: Make sure to set Error on realize failure

[Raphael Norwitz <raphael.norwitz@nutanix.com>]

Acked-by: Raphael Norwitz <raphael.norwitz@nutanix.com>

On Thu, Apr 29, 2021 at 07:13:11PM +0200, Kevin Wolf wrote:
> We have to set errp before jumping to virtio_err, otherwise the caller
> (virtio_device_realize()) will take this as success and crash when it
> later tries to access things that we've already freed in the error path.
> 
> Fixes: 77542d431491788d1e8e79d93ce10172ef207775
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>  hw/block/vhost-user-blk.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
> index f5e9682703..7c85248a7b 100644
> --- a/hw/block/vhost-user-blk.c
> +++ b/hw/block/vhost-user-blk.c
> @@ -447,7 +447,6 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
>  {
>      VirtIODevice *vdev = VIRTIO_DEVICE(dev);
>      VHostUserBlk *s = VHOST_USER_BLK(vdev);
> -    Error *err = NULL;
>      int i, ret;
>  
>      if (!s->chardev.chr) {
> @@ -495,8 +494,7 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
>                               NULL, true);
>  
>  reconnect:
> -    if (qemu_chr_fe_wait_connected(&s->chardev, &err) < 0) {
> -        error_report_err(err);
> +    if (qemu_chr_fe_wait_connected(&s->chardev, errp) < 0) {
>          goto virtio_err;
>      }
>  
> -- 
> 2.30.2
>