diff --git a/reactos/ntoskrnl/fstub/disksup.c b/reactos/ntoskrnl/fstub/disksup.c
index 86a7e0ad6b0..f5aeb4192f1 100644
--- a/reactos/ntoskrnl/fstub/disksup.c
+++ b/reactos/ntoskrnl/fstub/disksup.c
@@ -1787,7 +1787,11 @@ xHalIoReadPartitionTable(IN PDEVICE_OBJECT DeviceObject,
 
     /* Free the buffer and check for success */
     if (Buffer) ExFreePoolWithTag(Buffer, TAG_FILE_SYSTEM);
-    if (!NT_SUCCESS(Status)) ExFreePoolWithTag(*PartitionBuffer, TAG_FILE_SYSTEM);
+    if (!NT_SUCCESS(Status))
+    {
+        ExFreePoolWithTag(*PartitionBuffer, TAG_FILE_SYSTEM);
+        *PartitionBuffer = NULL;
+    }
 
     /* Return status */
     return Status;