diff --git a/mm/mmap.c b/mm/mmap.c
index 0bb74ca..7f684d5 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -778,10 +778,12 @@
 		if (exporter && exporter->anon_vma && !importer->anon_vma) {
 			int error;
 
-			error = anon_vma_clone(importer, exporter);
-			if (error)
-				return error;
 			importer->anon_vma = exporter->anon_vma;
+			error = anon_vma_clone(importer, exporter);
+			if (error) {
+				importer->anon_vma = NULL;
+				return error;
+			}
 		}
 	}