| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 100/121] virtio_net: check return value of skb_to_sgvec in one more location | Date | Wed, 11 Apr 2018 20:36:43 +0200 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Nathan Chancellor <natechancellor@gmail.com>
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@zx2c4.com> Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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 @@ -551,7 +551,12 @@ static int add_recvbuf_small(struct rece hdr = skb_vnet_hdr(skb); sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr); - 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)
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