[PATCH 2.6.13-rc4 2/2] fix possible null pointer access - acpi_pci_irq_disable

[Kenji Kaneshige <kaneshige.kenji-+CUm20s59erQFUHtdCDX3A@public.gmane.org>]

This patch fixes possible null pointer access in acpi_pci_irq_disable.

The 'bus' field in pci_dev structure should be checked before calling
pci_read_config_byte() because pci_bus_read_config_byte() called by
pci_read_config_byte() refers to 'bus' field.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
---

 drivers/acpi/pci_irq.c |    5 +----
 1 files changed, 1 insertion(+), 4 deletions(-)

diff -puN drivers/acpi/pci_irq.c~fix-possible-null-pointer-access-acpi_pci_irq_disable drivers/acpi/pci_irq.c
--- linux-2.6.13-rc4/drivers/acpi/pci_irq.c~fix-possible-null-pointer-access-acpi_pci_irq_disable	2005-08-01 12:20:31.000000000 +0900
+++ linux-2.6.13-rc4-kanesige/drivers/acpi/pci_irq.c	2005-08-01 12:20:31.000000000 +0900
@@ -474,7 +474,7 @@ acpi_pci_irq_disable (
 
 	ACPI_FUNCTION_TRACE("acpi_pci_irq_disable");
 
-	if (!dev)
+	if (!dev || !dev->bus)
 		return_VOID;
 
 	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
@@ -482,9 +482,6 @@ acpi_pci_irq_disable (
 		return_VOID;
 	pin--;
 
-	if (!dev->bus)
-		return_VOID;
-
 	/*
 	 * First we check the PCI IRQ routing table (PRT) for an IRQ.
 	 */
_



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