From: Thomas Renninger <trenn@suse.de>
Date: Wed, 12 Mar 2008 00:06:24 +0000 (+0100)
Subject: ACPICA: Warn if packages with invalid references are evaluated
X-Git-Tag: v2.6.25-rc6~19^2~2^3~1
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=b6a163875935ce8e8e85901a7f2b68f7a314d914;p=linux-2.6-omap-h63xx.git

ACPICA: Warn if packages with invalid references are evaluated

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>
---

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index eba55b7d6c9..44ea60cf21c 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -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;