]> git.hungrycats.org Git - linux/commitdiff
virtio-net: drop NETIF_F_FRAGLIST
authorJason Wang <jasowang@redhat.com>
Wed, 5 Aug 2015 02:34:04 +0000 (10:34 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 9 Dec 2015 18:42:54 +0000 (13:42 -0500)
[ 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

index 841b60831df1b2e83c12f55ee5e8fc90874b9475..5c150a0c5ee21b2348aae86209c9ce4ee4d81019 100644 (file)
@@ -1652,9 +1652,9 @@ static int virtnet_probe(struct virtio_device *vdev)
        /* 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