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[PATCH] forcedeth: fix random memory scribbling bug 

Two critical bugs were found in forcedeth 0.47:
 - TSO doesn't work.
 - pci_map_single() for the rx buffers is called with size==0.  This bug
   is critical, it causes random memory corruptions on systems with an
   iommu.

Below is a minimal fix for both bugs, for 2.6.15.

TSO will be fixed properly in the next version.  Tested on x86-64.

Signed-Off-By: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Manfred Spraul 2005-12-24 14:19:24 +01:00 committed by Linus Torvalds
parent 8f43d8e114
commit 1836098f97
1 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/net/forcedeth.c
View File

@ -10,7 +10,7 @@
* trademarks of NVIDIA Corporation in the United States and other
* countries.
*
* Copyright (C) 2003,4 Manfred Spraul
* Copyright (C) 2003,4,5 Manfred Spraul
* Copyright (C) 2004 Andrew de Quincey (wol support)
* Copyright (C) 2004 Carl-Daniel Hailfinger (invalid MAC handling, insane
* IRQ rate fixes, bigendian fixes, cleanups, verification)
@ -100,6 +100,7 @@
* 0.45: 18 Sep 2005: Remove nv_stop/start_rx from every link check
* 0.46: 20 Oct 2005: Add irq optimization modes.
* 0.47: 26 Oct 2005: Add phyaddr 0 in phy scan.
* 0.48: 24 Dec 2005: Disable TSO, bugfix for pci_map_single
*
* Known bugs:
* We suspect that on some hardware no TX done interrupts are generated.
@ -111,7 +112,7 @@
* DEV_NEED_TIMERIRQ will not harm you on sane hardware, only generating a few
* superfluous timer interrupts from the nic.
*/
#define FORCEDETH_VERSION "0.47"
#define FORCEDETH_VERSION "0.48"
#define DRV_NAME "forcedeth"
#include <linux/module.h>
@ -871,8 +872,8 @@ static int nv_alloc_rx(struct net_device *dev)
} else {
skb = np->rx_skbuff[nr];
}
np->rx_dma[nr] = pci_map_single(np->pci_dev, skb->data, skb->len,
PCI_DMA_FROMDEVICE);
np->rx_dma[nr] = pci_map_single(np->pci_dev, skb->data,
skb->end-skb->data, PCI_DMA_FROMDEVICE);
if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
np->rx_ring.orig[nr].PacketBuffer = cpu_to_le32(np->rx_dma[nr]);
wmb();
@ -999,7 +1000,7 @@ static void nv_drain_rx(struct net_device *dev)
wmb();
if (np->rx_skbuff[i]) {
pci_unmap_single(np->pci_dev, np->rx_dma[i],
np->rx_skbuff[i]->len,
np->rx_skbuff[i]->end-np->rx_skbuff[i]->data,
PCI_DMA_FROMDEVICE);
dev_kfree_skb(np->rx_skbuff[i]);
np->rx_skbuff[i] = NULL;
@ -1334,7 +1335,7 @@ static void nv_rx_process(struct net_device *dev)
* the performance.
*/
pci_unmap_single(np->pci_dev, np->rx_dma[i],
np->rx_skbuff[i]->len,
np->rx_skbuff[i]->end-np->rx_skbuff[i]->data,
PCI_DMA_FROMDEVICE);
{
@ -2455,7 +2456,7 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
np->txrxctl_bits |= NVREG_TXRXCTL_RXCHECK;
dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
#ifdef NETIF_F_TSO
dev->features |= NETIF_F_TSO;
/* disabled dev->features |= NETIF_F_TSO; */
#endif
}