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Message-Id: <1392184666-17616-1-git-send-email-jasowang@redhat.com> Date: Wed, 12 Feb 2014 13:57:46 +0800 From: Jason Wang <jasowang@...hat.com> To: mst@...hat.com, kvm@...r.kernel.org, virtio-dev@...ts.oasis-open.org, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Jason Wang <jasowang@...hat.com> Subject: [PATCH net] vhost_net: do not report a used len larger than receive buffer size 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 <mst@...hat.com> Signed-off-by: Jason Wang <jasowang@...hat.com> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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