mlx4_en: Handle page allocation failure during receive

If we failed to allocate new fragments for receive buffer,
the packet should be dropped and packets should be reused.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/mlx4/en_rx.c b/drivers/net/mlx4/en_rx.c
index 0cbb78ca7b29..7942c4d3cd88 100644
--- a/drivers/net/mlx4/en_rx.c
+++ b/drivers/net/mlx4/en_rx.c
@@ -610,6 +610,10 @@ static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
                                                       skb_shinfo(skb)->frags,
                                                       page_alloc, length);
+                if (unlikely(!used_frags)) {
+                        kfree_skb(skb);
+                        return NULL;
+                }
                 skb_shinfo(skb)->nr_frags = used_frags;
 
                 /* Copy headers into the skb linear buffer */