From: Olof Johansson <olof@lixom.net>
Date: Wed, 7 Nov 2007 04:21:38 +0000 (-0600)
Subject: pasemi_mac: Fix CRC checks
X-Git-Tag: v2.6.24-rc3~163^2~6
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=32bee776533eea839f9499d985c1490b5ac98512;p=linux-2.6

pasemi_mac: Fix CRC checks

Make sure we don't feed packets with bad CRC up the network stack,
and discount the packet length as reported from the MAC for the CRC
field.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---

diff --git a/drivers/net/pasemi_mac.c b/drivers/net/pasemi_mac.c
index b14f171b1b..09b4fde8d9 100644
--- a/drivers/net/pasemi_mac.c
+++ b/drivers/net/pasemi_mac.c
@@ -580,6 +580,16 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 
 		len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 
+		pci_unmap_single(mac->dma_pdev, dma, len, PCI_DMA_FROMDEVICE);
+
+		if (macrx & XCT_MACRX_CRC) {
+			/* CRC error flagged */
+			mac->netdev->stats.rx_errors++;
+			mac->netdev->stats.rx_crc_errors++;
+			dev_kfree_skb_irq(skb);
+			goto next;
+		}
+
 		if (len < 256) {
 			struct sk_buff *new_skb;
 
@@ -595,11 +605,10 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 		} else
 			info->skb = NULL;
 
-		pci_unmap_single(mac->dma_pdev, dma, len, PCI_DMA_FROMDEVICE);
-
 		info->dma = 0;
 
-		skb_put(skb, len);
+		/* Don't include CRC */
+		skb_put(skb, len-4);
 
 		if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
@@ -614,6 +623,7 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 		skb->protocol = eth_type_trans(skb, mac->netdev);
 		netif_receive_skb(skb);
 
+next:
 		RX_RING(mac, n) = 0;
 		RX_RING(mac, n+1) = 0;