[PATCH] acpica: nspredef: fix null pointer dereference issue (LP: #1195251)

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

I found that a _WAK that does not return a package trips a null
pointer reference.  Check for a null pointer before the
dereferencing of *ReturnObjectPtr.   This is a hot fix workaround,
we should pick up the official fix in later version of ACPICA.

Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 src/acpica/source/components/namespace/nspredef.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/acpica/source/components/namespace/nspredef.c b/src/acpica/source/components/namespace/nspredef.c
index 941c3bd..e7bc55b 100644
--- a/src/acpica/source/components/namespace/nspredef.c
+++ b/src/acpica/source/components/namespace/nspredef.c
@@ -237,6 +237,11 @@ AcpiNsCheckReturnValue (
         goto Exit;
     }
 
+    if (!(*ReturnObjectPtr))
+    {
+        Status = AE_AML_NO_RETURN_VALUE;
+        goto Exit;
+    }
     /*
      * For returned Package objects, check the type of all sub-objects.
      * Note: Package may have been newly created by call above.
-- 
1.8.3.1