net: bcmgenet: Add a check for oversized packets

Occasionnaly we may get oversized packets from the hardware which
exceed the nomimal 2KiB buffer size we allocate SKBs with. Add an early
check which drops the packet to avoid invoking skb_over_panic() and move
on to processing the next packet.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 21973046b12b476d408dd3e6f82535cbac4bd0ac..d937daa8ee883828a429e35e0a5752f0590afe2a 100644 (file)
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -2316,6 +2316,14 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring,
                          __func__, p_index, ring->c_index,
                          ring->read_ptr, dma_length_status);
 
+               if (unlikely(len > RX_BUF_LENGTH)) {
+                       netif_err(priv, rx_status, dev, "oversized packet\n");
+                       dev->stats.rx_length_errors++;
+                       dev->stats.rx_errors++;
+                       dev_kfree_skb_any(skb);
+                       goto next;
+               }
+
                if (unlikely(!(dma_flag & DMA_EOP) || !(dma_flag & DMA_SOP))) {
                        netif_err(priv, rx_status, dev,
                                  "dropping fragmented packet!\n");