linux-kernel - Re: [PATCH] vhost/net: length miscalculation

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Message-ID: <54AD9DD8.2080008@cogentembedded.com>
Date:	Wed, 07 Jan 2015 23:58:00 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
CC:	Alex Williamson <alex.williamson@...hat.com>,
	Greg Kurz <gkurz@...ux.vnet.ibm.com>, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH] vhost/net: length miscalculation

Hello.

On 01/07/2015 11:55 AM, Michael S. Tsirkin wrote:

> commit 8b38694a2dc8b18374310df50174f1e4376d6824
>      vhost/net: virtio 1.0 byte swap
> had this chunk:
> -       heads[headcount - 1].len += datalen;
> +       heads[headcount - 1].len = cpu_to_vhost32(vq, len - datalen);

> This adds datalen with the wrong sign, causing guest panics.

> Fixes: 8b38694a2dc8b18374310df50174f1e4376d6824

    The format of this tag assumes 12-digit SHA1 hash and the commit 
description enclosed in parens and double quotes. See 
Documentation/SubmittingPatches.

> Reported-by: Alex Williamson <alex.williamson@...hat.com>
> Suggested-by: Greg Kurz <gkurz@...ux.vnet.ibm.com>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

WBR, Sergei

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