From: Jason Wang <jasowang@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: netdev@vger.kernel.org, David Miller <davem@davemloft.net>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] vhost: fix length for cross region descriptor
Date: Tue, 27 Nov 2012 13:47:50 +0800 [thread overview]
Message-ID: <50B45406.40603@redhat.com> (raw)
In-Reply-To: <20121126155727.GA21716@redhat.com>
On 11/26/2012 11:57 PM, Michael S. Tsirkin wrote:
> If a single descriptor crosses a region, the
> second chunk length should be decremented
> by size translated so far, instead it includes
> the full descriptor length.
>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> drivers/vhost/vhost.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index ef8f598..5a3d0f1 100644
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -1049,7 +1049,7 @@ static int translate_desc(struct vhost_dev *dev, u64 addr, u32 len,
> }
> _iov = iov + ret;
> size = reg->memory_size - addr + reg->guest_phys_addr;
> - _iov->iov_len = min((u64)len, size);
> + _iov->iov_len = min((u64)len - s, size);
> _iov->iov_base = (void __user *)(unsigned long)
> (reg->userspace_addr + addr - reg->guest_phys_addr);
> s += size;
Acked-by: Jason Wang <jasowang@redhat.com>
next prev parent reply other threads:[~2012-11-27 5:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-26 15:57 [PATCH] vhost: fix length for cross region descriptor Michael S. Tsirkin
2012-11-27 5:47 ` Jason Wang [this message]
2012-11-28 16:27 ` David Miller
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