netdev - [PATCH] virtio-net: free bufs correctly on invalid packet length

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Message-Id: <1386274612-18379-1-git-send-email-mwdalton@google.com>
Date:	Thu,  5 Dec 2013 12:16:52 -0800
From:	Michael Dalton <mwdalton@...gle.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Andrey Vagin <avagin@...nvz.org>,
	virtualization@...ts.linux-foundation.org,
	Michael Dalton <mwdalton@...gle.com>
Subject: [PATCH] virtio-net: free bufs correctly on invalid packet length

When a packet with invalid length arrives, ensure that the packet
is freed correctly if mergeable packet buffers and big packets
(GUEST_TSO4) are both enabled.
---
 drivers/net/virtio_net.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 916241d..6a4665c 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -426,10 +426,10 @@ static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
 	if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
 		pr_debug("%s: short packet %i\n", dev->name, len);
 		dev->stats.rx_length_errors++;
-		if (vi->big_packets)
-			give_pages(rq, buf);
-		else if (vi->mergeable_rx_bufs)
+		if (vi->mergeable_rx_bufs)
 			put_page(virt_to_head_page(buf));
+		else if (vi->big_packets)
+			give_pages(rq, buf);
 		else
 			dev_kfree_skb(buf);
 		return;
-- 
1.8.5.1

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