- Fix a potential crash in IoGetLowerDeviceObject if nothing is attached to us

svn path=/trunk/; revision=41249
2024-10-04 16:36:11 +00:00 · 2009-06-02 01:34:12 +00:00 · 2009-06-02 01:34:12 +00:00 · e640466446
parent e4a0b00377
commit e640466446
1 changed files with 6 additions and 2 deletions
--- a/reactos/ntoskrnl/io/iomgr/device.c
+++ b/reactos/ntoskrnl/io/iomgr/device.c
@ -1186,8 +1186,12 @@ IoGetLowerDeviceObject(IN PDEVICE_OBJECT DeviceObject)
        /* Get the Lower Device Object */
        LowerDeviceObject = DeviceExtension->AttachedTo;

-        /* Reference it */
-        ObReferenceObject(LowerDeviceObject);
+        /* Check that we got a valid device object */
+        if (LowerDeviceObject)
+        {
+            /* We did so let's reference it */
+            ObReferenceObject(LowerDeviceObject);
+        }
    }

    /* Return it */