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ACPICA: Warn if packages with invalid references are evaluated

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And return an error to avoid NULL pointer access by the caller
Lin Ming's patch avoids corrupted mem access when
BIOS has invalid references included, the handle is now zero
instead of corrupted.

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Thomas Renninger 2008-03-12 01:06:24 +01:00 committed by Len Brown
parent d6f882e104
commit b6a1638759
1 changed files with 6 additions and 0 deletions
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6
drivers/acpi/utils.c
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@ -407,6 +407,12 @@ acpi_evaluate_reference(acpi_handle handle,
break;
}
if (!element->reference.handle) {
printk(KERN_WARNING PREFIX "Invalid reference in"
" package %s\n", pathname);
status = AE_NULL_ENTRY;
break;
}
/* Get the acpi_handle. */
list->handles[i] = element->reference.handle;