mlx4_en: Fix read buffer overflow in mlx4_en_complete_rx_desc()

[cascardo/linux.git] / drivers / net / mlx4 / en_rx.c

diff --git a/drivers/net/mlx4/en_rx.c b/drivers/net/mlx4/en_rx.c
index 91bdfdf..3ac0404 100644 (file)
--- a/drivers/net/mlx4/en_rx.c
+++ b/drivers/net/mlx4/en_rx.c
@@ -506,8 +506,9 @@ static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
                                 PCI_DMA_FROMDEVICE);
        }
        /* Adjust size of last fragment to match actual length */
-       skb_frags_rx[nr - 1].size = length -
-               priv->frag_info[nr - 1].frag_prefix_size;
+       if (nr > 0)
+               skb_frags_rx[nr - 1].size = length -
+                       priv->frag_info[nr - 1].frag_prefix_size;
        return nr;
 
 fail: