[PATCH v6 5/5] virtio_net: check return value of skb_to_sgvec always

[Jason A. Donenfeld]

Signed-off-by: Jason A. Donenfeld <ja...@zx2c4.com>
---
 drivers/net/virtio_net.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index f36584616e7d..1709fd0b4bf7 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1081,7 +1081,7 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff 
*skb)
        struct virtio_net_hdr_mrg_rxbuf *hdr;
        const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
        struct virtnet_info *vi = sq->vq->vdev->priv;
-       unsigned num_sg;
+       int num_sg;
        unsigned hdr_len = vi->hdr_len;
        bool can_push;
 
@@ -1114,6 +1114,8 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff 
*skb)
                sg_set_buf(sq->sg, hdr, hdr_len);
                num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
        }
+       if (unlikely(num_sg < 0))
+               return num_sg;
        return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
 }
 
-- 
2.12.2