kernel: bgmac: rework patch checking packet length

[openwrt.git] / target / linux / generic / patches-3.12 / 775-bgmac-check-length-of-received-frame.patch

diff --git a/target/linux/generic/patches-3.12/775-bgmac-check-length-of-received-frame.patch b/target/linux/generic/patches-3.12/775-bgmac-check-length-of-received-frame.patch
new file mode 100644 (file)
index 0000000..c3d63b6
--- /dev/null
+++ b/target/linux/generic/patches-3.12/775-bgmac-check-length-of-received-frame.patch
@@ -0,0 +1,39 @@
+From 2d12a9abf3f81de5b51852e3cfcba8cedac82642 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Fri, 6 Dec 2013 01:14:52 +0100
+Subject: [PATCH] bgmac: check length of received frame
+
+---
+ drivers/net/ethernet/broadcom/bgmac.c |    9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -363,6 +363,27 @@ static int bgmac_dma_rx_read(struct bgma
+                       dma_addr_t old_dma_addr = slot->dma_addr;
+                       int err;
+ 
++                      if (len > BGMAC_RX_MAX_FRAME_SIZE) {
++                              struct bgmac_dma_desc *dma_desc = ring->cpu_base + ring->start;
++
++                              bgmac_err(bgmac, "Hardware reported invalid packet length %d for slot %d!\n", len, ring->start);
++                              bgmac_err(bgmac, "flags: 0x%04X\n", flags);
++                              bgmac_err(bgmac, "ctl0: 0x%08X\tctl1: 0x%08X\n", le32_to_cpu(dma_desc->ctl0), le32_to_cpu(dma_desc->ctl1));
++
++                              bgmac_err(bgmac, "   BGMAC_DMA_RX_CTL: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_CTL));
++                              bgmac_err(bgmac, " BGMAC_DMA_RX_INDEX: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX));
++                              bgmac_err(bgmac, "BGMAC_DMA_RX_RINGLO: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_RINGLO));
++                              bgmac_err(bgmac, "BGMAC_DMA_RX_RINGHI: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_RINGHI));
++                              bgmac_err(bgmac, "BGMAC_DMA_RX_STATUS: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_STATUS));
++                              bgmac_err(bgmac, " BGMAC_DMA_RX_ERROR: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_ERROR));
++
++                              dma_sync_single_for_device(dma_dev,
++                                                         slot->dma_addr,
++                                                         BGMAC_RX_BUF_SIZE,
++                                                         DMA_FROM_DEVICE);
++                              break;
++                      }
++
+                       /* Check for poison and drop or pass the packet */
+                       if (len == 0xdead && flags == 0xbeef) {
+                               bgmac_err(bgmac, "Found poisoned packet at slot %d, DMA issue!\n",