shallow: fix memory leak when registering shallow roots

When registering shallow roots, we unset the list of parents of the
to-be-registered commit if it's already been parsed. This causes us to
leak memory though because we never free this list. Fix this.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

shallow.c

@@ -38,8 +38,10 @@ int register_shallow(struct repository *r, const struct object_id *oid)
 
 	oidcpy(&graft->oid, oid);
 	graft->nr_parent = -1;
-	if (commit && commit->object.parsed)
+	if (commit && commit->object.parsed) {
+		free_commit_list(commit->parents);
 		commit->parents = NULL;
+	}
 	return register_commit_graft(r, graft, 0);
 }
 

t/t5311-pack-bitmaps-shallow.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='check bitmap operation with shallow repositories'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # We want to create a situation where the shallow, grafted

t/t5530-upload-pack-error.sh

@@ -2,6 +2,7 @@
 
 test_description='errors in upload-pack'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 D=$(pwd)