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

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Hello.

On 12/05/2013 11:16 PM, Michael Dalton wrote:

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.

Looks like a similar patch have been posted by Andrey Vagin today. You also forgot to sign off the patch, so it can't be applied anyway.

---
  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;

WBR, Sergei

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