[PATCH] fix possible null pointer reference in acpi_pci_irq_enable

[PATCH] fix possible null pointer reference in acpi_pci_irq_enable

[Kenji Kaneshige]

Hi,

The following patch fixes possible null pointer reference in
acpi_pci_irq_enable().

Thanks,
Kenji Kaneshige


acpi_pci_irq_enable() should check if dev->bus is NULL before calling
pci_read_config_byte that refers it.

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


---

 linux-2.6.11-kanesige/drivers/acpi/pci_irq.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff -puN drivers/acpi/pci_irq.c~fix_acpi_pci_irq_enable drivers/acpi/pci_irq.c
--- linux-2.6.11/drivers/acpi/pci_irq.c~fix_acpi_pci_irq_enable	2005-03-30 10:11:55.000000000 +0900
+++ linux-2.6.11-kanesige/drivers/acpi/pci_irq.c	2005-03-30 10:12:37.000000000 +0900
@@ -395,6 +395,11 @@ acpi_pci_irq_enable (
 	if (!dev)
 		return_VALUE(-EINVAL);
 	
+	if (!dev->bus) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) 'bus' field\n"));
+		return_VALUE(-ENODEV);
+	}
+
 	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
 	if (!pin) {
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No interrupt pin configured for device %s\n", pci_name(dev)));
@@ -402,11 +407,6 @@ acpi_pci_irq_enable (
 	}
 	pin--;
 
-	if (!dev->bus) {
-		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) 'bus' field\n"));
-		return_VALUE(-ENODEV);
-	}
-
 	/* 
 	 * First we check the PCI IRQ routing table (PRT) for an IRQ.  PRT
 	 * values override any BIOS-assigned IRQs set during boot.

_


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