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authorJason A. Donenfeld <Jason@zx2c4.com>2017-06-04 04:16:26 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-04-13 19:50:23 +0200
commit2f483e77b0fd425d64e99095f497dbf3cf9f27fb (patch)
tree4cf5eca9db3a6d2db986784b7c882a3ee11124b9
parentea63eca9b1c613f29885bf1236a0c5843bd613dd (diff)
virtio_net: check return value of skb_to_sgvec always
commit e2fcad58fd230f635a74e4e983c6f4ea893642d2 upstream. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> [natechancellor: backport to 4.4] Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/virtio_net.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 8dfc75250583..bb2bae522f67 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -858,7 +858,7 @@ 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;
@@ -911,11 +911,16 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
if (can_push) {
__skb_push(skb, hdr_len);
num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
+ if (unlikely(num_sg < 0))
+ return num_sg;
/* Pull header back to avoid skew in tx bytes calculations. */
__skb_pull(skb, hdr_len);
} else {
sg_set_buf(sq->sg, hdr, hdr_len);
- num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
+ num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
+ if (unlikely(num_sg < 0))
+ return num_sg;
+ num_sg++;
}
return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
}