[2.6 patch] drivers/acpi/video.c: fix a NULL pointer dereference

From: Adrian Bunk
Date: Fri Mar 10 2006 - 12:06:45 EST


The Coverity checker spotted this obvious bug in
acpi_video_device_lcd_query_levels().



Signed-off-by: Adrian Bunk <bunk@xxxxxxxxx>

--- linux-2.6.16-rc5-mm3-full/drivers/acpi/video.c.old 2006-03-10 18:04:18.000000000 +0100
+++ linux-2.6.16-rc5-mm3-full/drivers/acpi/video.c 2006-03-10 18:04:33.000000000 +0100
@@ -321,11 +321,11 @@ acpi_video_device_lcd_query_levels(struc

status = acpi_evaluate_object(device->handle, "_BCL", NULL, &buffer);
if (!ACPI_SUCCESS(status))
return_VALUE(status);
obj = (union acpi_object *)buffer.pointer;
- if (!obj && (obj->type != ACPI_TYPE_PACKAGE)) {
+ if (obj && (obj->type != ACPI_TYPE_PACKAGE)) {
ACPI_ERROR((AE_INFO, "Invalid _BCL data"));
status = -EFAULT;
goto err;
}


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