Re: [patch] xen-blkback: add missing return on error in xen_update_blkif_status()

[Laszlo Ersek]

On 08/05/11 16:18, Dan Carpenter wrote:
> We should return here after reporting the error.  Otherwise we'd hit
> a NULL deref of blkif->xenblkd on the next line.
>
> Signed-off-by: Dan Carpenter<error27@xxxxxxxxx>
>
> diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
> index 32d4c3c..b750299 100644
> --- a/drivers/block/xen-blkback/xenbus.c
> +++ b/drivers/block/xen-blkback/xenbus.c
> @@ -107,6 +107,7 @@ static void xen_update_blkif_status(struct xen_blkif *blkif)
>   		err = PTR_ERR(blkif->xenblkd);
>   		blkif->xenblkd = NULL;
>   		xenbus_dev_error(blkif->be->dev, err, "start xenblkd");
> +		return;
>   	}
>
>   	blkif->be->kthread_pid = blkif->xenblkd->pid;

In case somebody were asking for my opinion:

I think this block was the last block in the originally containing 
function (update_blkif_status()?), thus the "return" wasn't needed 
there. I guess the block got copied and then other code was added below it.

Acked-by: Laszlo Ersek <lersek@xxxxxxxxxx>
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