Patch "virtio-net: drop NETIF_F_FRAGLIST" has been added to the 4.1-stable tree

Patch "virtio-net: drop NETIF_F_FRAGLIST" has been added to the 4.1-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    virtio-net: drop NETIF_F_FRAGLIST

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     virtio-net-drop-netif_f_fraglist.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Tue Nov 17 14:35:45 PST 2015
From: Jason Wang <jasowang@redhat.com>
Date: Wed, 5 Aug 2015 10:34:04 +0800
Subject: virtio-net: drop NETIF_F_FRAGLIST

From: Jason Wang <jasowang@redhat.com>

[ Upstream commit 48900cb6af4282fa0fb6ff4d72a81aa3dadb5c39 ]

virtio declares support for NETIF_F_FRAGLIST, but assumes
that there are at most MAX_SKB_FRAGS + 2 fragments which isn't
always true with a fraglist.

A longer fraglist in the skb will make the call to skb_to_sgvec overflow
the sg array, leading to memory corruption.

Drop NETIF_F_FRAGLIST so we only get what we can handle.

Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/virtio_net.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1756,9 +1756,9 @@ static int virtnet_probe(struct virtio_d
 	/* Do we support "hardware" checksums? */
 	if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
 		/* This opens up the world of extra features. */
-		dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
+		dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
 		if (csum)
-			dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
+			dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
 
 		if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
 			dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO


Patches currently in stable-queue which might be from jasowang@redhat.com are

queue-4.1/virtio-net-drop-netif_f_fraglist.patch
queue-4.1/macvtap-unbreak-receiving-of-gro-skb-with-frag-list.patch