Subject: Re: [PATCH] vhost/net: length miscalculation

From: Sergei Shtylyov <[email-masked]>
Date: Wed, 07 Jan 2015 23:58:00 +0300

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

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> Reported-by: Alex Williamson <[email-masked]>
> Suggested-by: Greg Kurz <[email-masked]>
> Signed-off-by: Michael S. Tsirkin <[email-masked]>

WBR, Sergei