From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: [PATCH net] vhost_net: do not report a used len larger than receive buffer size Date: Wed, 12 Feb 2014 13:57:46 +0800 Message-ID: <1392184666-17616-1-git-send-email-jasowang@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: mst@redhat.com, kvm@vger.kernel.org, virtio-dev@lists.oasis-open.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: virtualization@lists.linuxfoundation.org Currently, even if the packet were truncated by lower socket, we still report the packet size as the used len which may confuse guest driver. Fixes this by returning the size of guest receive buffer instead. Fixes 3a4d5c94e959359ece6d6b55045c3f046677f55c (vhost_net: a kernel-level virtio server) Cc: Michael S. Tsirkin Signed-off-by: Jason Wang --- drivers/vhost/net.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 9a68409..06268a0 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -525,7 +525,8 @@ static int get_rx_bufs(struct vhost_virtqueue *vq, ++headcount; seg += in; } - heads[headcount - 1].len += datalen; + if (likely(datalen < 0)) + heads[headcount - 1].len += datalen; *iovcount = seg; if (unlikely(log)) *log_num = nlogs; -- 1.8.3.2