Messages in this thread Patch in this message | | | Date | Sun, 29 Nov 2015 22:47:07 +0100 | From | Willy Tarreau <> | Subject | [PATCH 2.6.32 05/38] [PATCH 05/38] virtio-net: drop NETIF_F_FRAGLIST |
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2.6.32-longterm review patch. If anyone has any objections, please let me know.
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commit 48900cb6af4282fa0fb6ff4d72a81aa3dadb5c39 upstream.
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> [bwh: Backported to 2.6.32: there's only a single features field] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Willy Tarreau <w@1wt.eu> --- drivers/net/virtio_net.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 97a56f0..2bc6661 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -868,7 +868,7 @@ static int virtnet_probe(struct virtio_device *vdev) /* Do we support "hardware" checksums? */ if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { /* This opens up the world of extra features. */ - dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; + dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { dev->features |= NETIF_F_TSO | NETIF_F_UFO | NETIF_F_TSO_ECN | NETIF_F_TSO6; -- 1.7.12.2.21.g234cd45.dirty
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