[PATCH 2/3][STABLE] KVM: indicate oom if add_buf fails

["Bruce Rogers" <brogers@xxxxxxxxxx>]

This patch is a subset of an already upstream patch, but this portion is useful in earlier releases.
Please consider for stable.

    If the add_buf operation fails, indicate failure to the caller.
    Signed-off-by: Bruce Rogers <brogers@xxxxxxxxxx>

--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c

@@ -318,6 +318,7 @@ static bool try_fill_recv_maxbufs(struct
                        skb_unlink(skb, &vi->recv);
                        trim_pages(vi, skb);
                        kfree_skb(skb);
+                       oom = true;
                        break;
                }
                vi->num++;
@@ -368,6 +369,7 @@ static bool try_fill_recv(struct virtnet
                if (err < 0) {
                        skb_unlink(skb, &vi->recv);
                        kfree_skb(skb);
+                       oom = true;
                        break;
                }
                vi->num++;


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