linux-kernel - Re: [PATCH] drivers/block/xen-blkback: preq.dev is used without initialized

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Date:	Wed, 27 Feb 2013 09:57:55 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Chen Gang" <gang.chen@...anux.com>
Cc:	<roger.pau@...rix.com>, <stefano.stabellini@...citrix.com>,
	"xen-devel" <xen-devel@...ts.xen.org>, <konrad.wilk@...cle.com>,
	<dgdegra@...ho.nsa.gov>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/block/xen-blkback: preq.dev is used
 without initialized

>>> On 27.02.13 at 05:52, Chen Gang <gang.chen@...anux.com> wrote:
>   if call xen_vbd_translate failed, the preq.dev will be not initialized.
>   so use blkif->vbd.pdevice instead (still better to print relative info).

You also could have mentioned that even before commit 
01c681d4c70d64cb72142a2823f27c4146a02e63 the value printed
here was bogus, as it was the guest provided value from
req->u.rw.handle rather than the actual device.

Jan

> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  drivers/block/xen-blkback/blkback.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/block/xen-blkback/blkback.c 
> b/drivers/block/xen-blkback/blkback.c
> index de1f319..6d1cc3d 100644
> --- a/drivers/block/xen-blkback/blkback.c
> +++ b/drivers/block/xen-blkback/blkback.c
> @@ -904,7 +904,8 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
>  		pr_debug(DRV_PFX "access denied: %s of [%llu,%llu] on dev=%04x\n",
>  			 operation == READ ? "read" : "write",
>  			 preq.sector_number,
> -			 preq.sector_number + preq.nr_sects, preq.dev);
> +			 preq.sector_number + preq.nr_sects,
> +			 blkif->vbd.pdevice);
>  		goto fail_response;
>  	}
>  
> -- 
> 1.7.7.6



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