[tfaber] 70356: [NTOS:PNP] - Don't free NULL buffers returned from IopCaptureUnicodeString. CORE-10706 #resolve

Author: tfaber
Date: Wed Dec 16 10:05:15 2015
New Revision: 70356

URL: http://svn.reactos.org/svn/reactos?rev=70356&view=rev
Log:
[NTOS:PNP]
- Don't free NULL buffers returned from IopCaptureUnicodeString.
CORE-10706 #resolve

Modified:
    trunk/reactos/ntoskrnl/io/pnpmgr/plugplay.c

Modified: trunk/reactos/ntoskrnl/io/pnpmgr/plugplay.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/io/pnpmgr/plugpla…
==============================================================================
--- trunk/reactos/ntoskrnl/io/pnpmgr/plugplay.c	[iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/io/pnpmgr/plugplay.c	[iso-8859-1] Wed Dec 16 10:05:15 2015
@@ -247,7 +247,10 @@
     {
         /* Get the device object */
         DeviceObject = IopGetDeviceObjectFromDeviceInstance(&DeviceInstance);
-        ExFreePool(DeviceInstance.Buffer);
+        if (DeviceInstance.Buffer != NULL)
+        {
+            ExFreePool(DeviceInstance.Buffer);
+        }
     }
 
     Status = IoGetDeviceInterfaces(&FilterGuid, DeviceObject, StackList.Flags,
&SymbolicLinkList);
@@ -317,14 +320,20 @@
     }
     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
     {
-        ExFreePool(DeviceInstance.Buffer);
+        if (DeviceInstance.Buffer != NULL)
+        {
+            ExFreePool(DeviceInstance.Buffer);
+        }
         _SEH2_YIELD(return _SEH2_GetExceptionCode());
     }
     _SEH2_END;
 
     /* Get the device object */
     DeviceObject = IopGetDeviceObjectFromDeviceInstance(&DeviceInstance);
-    ExFreePool(DeviceInstance.Buffer);
+    if (DeviceInstance.Buffer != NULL)
+    {
+        ExFreePool(DeviceInstance.Buffer);
+    }
     if (DeviceObject == NULL)
     {
         return STATUS_NO_SUCH_DEVICE;
@@ -394,7 +403,10 @@
     }
     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
     {
-        ExFreePool(TargetDeviceInstance.Buffer);
+        if (TargetDeviceInstance.Buffer != NULL)
+        {
+            ExFreePool(TargetDeviceInstance.Buffer);
+        }
         _SEH2_YIELD(return _SEH2_GetExceptionCode());
     }
     _SEH2_END;
@@ -406,13 +418,19 @@
                               TRUE))
     {
         DeviceNode = IopRootDeviceNode;
-        ExFreePool(TargetDeviceInstance.Buffer);
+        if (TargetDeviceInstance.Buffer != NULL)
+        {
+            ExFreePool(TargetDeviceInstance.Buffer);
+        }
     }
     else
     {
         /* Get the device object */
         DeviceObject = IopGetDeviceObjectFromDeviceInstance(&TargetDeviceInstance);
-        ExFreePool(TargetDeviceInstance.Buffer);
+        if (TargetDeviceInstance.Buffer != NULL)
+        {
+            ExFreePool(TargetDeviceInstance.Buffer);
+        }
         if (DeviceObject == NULL)
             return STATUS_NO_SUCH_DEVICE;
 
@@ -566,14 +584,20 @@
     }
     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
     {
-        ExFreePool(DeviceInstance.Buffer);
+        if (DeviceInstance.Buffer != NULL)
+        {
+            ExFreePool(DeviceInstance.Buffer);
+        }
         _SEH2_YIELD(return _SEH2_GetExceptionCode());
     }
     _SEH2_END;
 
     /* Get the device object */
     DeviceObject = IopGetDeviceObjectFromDeviceInstance(&DeviceInstance);
-    ExFreePool(DeviceInstance.Buffer);
+    if (DeviceInstance.Buffer != NULL)
+    {
+        ExFreePool(DeviceInstance.Buffer);
+    }
     if (DeviceObject == NULL)
     {
         return STATUS_NO_SUCH_DEVICE;
@@ -647,7 +671,10 @@
 
     /* Get the device object */
     DeviceObject = IopGetDeviceObjectFromDeviceInstance(&DeviceInstance);
-    ExFreePool(DeviceInstance.Buffer);
+    if (DeviceInstance.Buffer != NULL)
+    {
+        ExFreePool(DeviceInstance.Buffer);
+    }
     if (DeviceObject == NULL)
     {
         return STATUS_NO_SUCH_DEVICE;
@@ -689,7 +716,10 @@
 
     /* Get the device object */
     DeviceObject = IopGetDeviceObjectFromDeviceInstance(&DeviceInstance);
-    ExFreePool(DeviceInstance.Buffer);
+    if (DeviceInstance.Buffer != NULL)
+    {
+        ExFreePool(DeviceInstance.Buffer);
+    }
     if (DeviceObject == NULL)
     {
         return STATUS_NO_SUCH_DEVICE;