linux-kernel - [PATCH 3.10 32/62] virtio_net: dont leak memory or block when too many frags

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Message-Id: <20140114002711.379826555@linuxfoundation.org>
Date:	Mon, 13 Jan 2014 16:26:57 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Michael Dalton <mwdalton@...gle.com>,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: [PATCH 3.10 32/62] virtio_net: dont leak memory or block when too many frags

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Michael S. Tsirkin" <mst@...hat.com>

We leak an skb when there are too many frags,
we also stop processing the packet in the middle,
the result is almost sure to be loss of networking.

Reported-by: Michael Dalton <mwdalton@...gle.com>
Acked-by: Michael Dalton <mwdalton@...gle.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/virtio_net.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -341,7 +341,7 @@ static struct sk_buff *receive_mergeable
 		if (i >= MAX_SKB_FRAGS) {
 			pr_debug("%s: packet too long\n", skb->dev->name);
 			skb->dev->stats.rx_length_errors++;
-			return NULL;
+			goto err_frags;
 		}
 		page = virtqueue_get_buf(rq->vq, &len);
 		if (!page) {
@@ -362,6 +362,7 @@ static struct sk_buff *receive_mergeable
 err_skb:
 	give_pages(rq, page);
 	while (--num_buf) {
+err_frags:
 		buf = virtqueue_get_buf(rq->vq, &len);
 		if (unlikely(!buf)) {
 			pr_debug("%s: rx error: %d buffers missing\n",


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