diff --git a/diffcore-order.c b/diffcore-order.c
index e7d20ebd2d..912513d3e6 100644
--- a/diffcore-order.c
+++ b/diffcore-order.c
@@ -14,8 +14,7 @@ static void prepare_order(const char *orderfile)
 {
 	int cnt, pass;
 	struct strbuf sb = STRBUF_INIT;
-	void *map;
-	char *cp, *endp;
+	const char *cp, *endp;
 	ssize_t sz;
 
 	if (order)
@@ -24,14 +23,13 @@ static void prepare_order(const char *orderfile)
 	sz = strbuf_read_file(&sb, orderfile, 0);
 	if (sz < 0)
 		die_errno(_("failed to read orderfile '%s'"), orderfile);
-	map = strbuf_detach(&sb, NULL);
-	endp = (char *) map + sz;
+	endp = sb.buf + sz;
 
 	for (pass = 0; pass < 2; pass++) {
 		cnt = 0;
-		cp = map;
+		cp = sb.buf;
 		while (cp < endp) {
-			char *ep;
+			const char *ep;
 			for (ep = cp; ep < endp && *ep != '\n'; ep++)
 				;
 			/* cp to ep has one line */
@@ -40,12 +38,7 @@ static void prepare_order(const char *orderfile)
 			else if (pass == 0)
 				cnt++;
 			else {
-				if (*ep == '\n') {
-					*ep = 0;
-					order[cnt] = cp;
-				} else {
-					order[cnt] = xmemdupz(cp, ep - cp);
-				}
+				order[cnt] = xmemdupz(cp, ep - cp);
 				cnt++;
 			}
 			if (ep < endp)
@@ -57,6 +50,8 @@ static void prepare_order(const char *orderfile)
 			ALLOC_ARRAY(order, cnt);
 		}
 	}
+
+	strbuf_release(&sb);
 }
 
 static int match_order(const char *path)
diff --git a/t/t4056-diff-order.sh b/t/t4056-diff-order.sh
index aec1d9d1b4..32c5fcb9a2 100755
--- a/t/t4056-diff-order.sh
+++ b/t/t4056-diff-order.sh
@@ -5,6 +5,7 @@ test_description='diff order & rotate'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 create_files () {
diff --git a/t/t4204-patch-id.sh b/t/t4204-patch-id.sh
index dc8ddb10af..c0a4a02dcf 100755
--- a/t/t4204-patch-id.sh
+++ b/t/t4204-patch-id.sh
@@ -5,6 +5,7 @@ test_description='git patch-id'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '