4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nathan Chancellor <natechancellor@xxxxxxxxx>
Kernels that do not have f6b10209b90d ("virtio-net: switch to use
build_skb() for small buffer") will have an extra call to skb_to_sgvec
that is not handled by e2fcad58fd23 ("virtio_net: check return value of
skb_to_sgvec always"). Since the former does not appear to be stable
material, just fix the call up directly.
Cc: Jason A. Donenfeld <Jason@xxxxxxxxx>
Cc: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/virtio_net.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -529,7 +529,12 @@ static int add_recvbuf_small(struct virt
hdr = skb_vnet_hdr(skb);
sg_init_table(rq->sg, 2);
sg_set_buf(rq->sg, hdr, vi->hdr_len);
- skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
+
+ err = skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
+ if (unlikely(err < 0)) {
+ dev_kfree_skb(skb);
+ return err;
+ }
err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
if (err < 0)