target/linux/generic/patches-3.18/077-08-bgmac-add-check-for-oversized-packets.patch

   1 From: Felix Fietkau <nbd@openwrt.org>
   2 Date: Sun, 12 Apr 2015 22:28:20 +0200
   3 Subject: [PATCH] bgmac: add check for oversized packets
   4
   5 In very rare cases, the MAC can catch an internal buffer that is bigger
   6 than it's supposed to be. Instead of crashing the kernel, simply pass
   7 the buffer back to the hardware
   8
   9 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
  10 ---
  11
  12 --- a/drivers/net/ethernet/broadcom/bgmac.c
  13 +++ b/drivers/net/ethernet/broadcom/bgmac.c
  14 @@ -445,6 +445,13 @@ static int bgmac_dma_rx_read(struct bgma
  15                                 break;
  16                         }
  17
  18 +                       if (len > BGMAC_RX_ALLOC_SIZE) {
  19 +                               bgmac_err(bgmac, "Found oversized packet at slot %d, DMA issue!\n",
  20 +                                         ring->start);
  21 +                               put_page(virt_to_head_page(buf));
  22 +                               break;
  23 +                       }
  24 +
  25                         /* Omit CRC. */
  26                         len -= ETH_FCS_LEN;
  27