From 6a6c708469c9e10fd87adcc3abff164270538d62 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Tue, 14 Apr 2015 12:07:58 +0200 Subject: [PATCH] bgmac: add check for oversized packets In very rare cases, the MAC can catch an internal buffer that is bigger than it's supposed to be. Instead of crashing the kernel, simply pass the buffer back to the hardware Signed-off-by: Felix Fietkau Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bgmac.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c index 60b5c3ca8551..5a20108c80e5 100644 --- a/drivers/net/ethernet/broadcom/bgmac.c +++ b/drivers/net/ethernet/broadcom/bgmac.c @@ -445,6 +445,13 @@ static int bgmac_dma_rx_read(struct bgmac *bgmac, struct bgmac_dma_ring *ring, break; } + if (len > BGMAC_RX_ALLOC_SIZE) { + bgmac_err(bgmac, "Found oversized packet at slot %d, DMA issue!\n", + ring->start); + put_page(virt_to_head_page(buf)); + break; + } + /* Omit CRC. */ len -= ETH_FCS_LEN; -- 2.20.1