wmi: fix memory leak in parse_wdg

This patch properly kfree out.pointer and gblock in error path.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

drivers/platform/x86/wmi.c

@@ -827,8 +827,10 @@ static __init acpi_status parse_wdg(acpi_handle handle)
 	total = obj->buffer.length / sizeof(struct guid_block);
 
 	gblock = kmemdup(obj->buffer.pointer, obj->buffer.length, GFP_KERNEL);
-	if (!gblock)
-		return AE_NO_MEMORY;
+	if (!gblock) {
+		status = AE_NO_MEMORY;
+		goto out_free_pointer;
+	}
 
 	for (i = 0; i < total; i++) {
 		/*
@@ -848,8 +850,10 @@ static __init acpi_status parse_wdg(acpi_handle handle)
 			wmi_dump_wdg(&gblock[i]);
 
 		wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
-		if (!wblock)
-			return AE_NO_MEMORY;
+		if (!wblock) {
+			status = AE_NO_MEMORY;
+			goto out_free_gblock;
+		}
 
 		wblock->gblock = gblock[i];
 		wblock->handle = handle;
@@ -860,8 +864,10 @@ static __init acpi_status parse_wdg(acpi_handle handle)
 		list_add_tail(&wblock->list, &wmi_blocks.list);
 	}
 
-	kfree(out.pointer);
+out_free_gblock:
 	kfree(gblock);
+out_free_pointer:
+	kfree(out.pointer);
 
 	return status;
 }