[PATCH v2 2/4] SANITIZE tests: fix memory leaks in t13*config*, add to whitelist

[Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>]

Fix a couple of trivial memory leaks introduced in 3efd0bedc6 (config:
add conditional include, 2017-03-01) and my own 867ad08a26 (hooks:
allow customizing where the hook directory is, 2016-05-04).

In the latter case the "fix" is UNLEAK() on the global variable. This
allows us to run all t13*config* tests under SANITIZE=leak.

With this change we can now run almost the whole set of config.c
tests (t13*config) under SANITIZE=leak, so let's do so, with a few
exceptions:

 * The test added in ce81b1da23 (config: add new way to pass config
   via `--config-env`, 2021-01-12), it fails in GitHub CI, but passes
   for me locally. Let's just skip it for now.

 * Ditto the split_cmdline and "aliases of builtins" tests, the former
   required splitting up an existing test, there an issue with the test
   that would have also been revealed by skipping it.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 config.c          | 17 ++++++++++++-----
 t/t1300-config.sh | 16 ++++++++++------
 t/test-lib.sh     |  1 +
 3 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/config.c b/config.c
index f9c400ad30..38e132c0e2 100644
--- a/config.c
+++ b/config.c
@@ -138,8 +138,10 @@ static int handle_path_include(const char *path, struct config_include_data *inc
 		return config_error_nonbool("include.path");
 
 	expanded = expand_user_path(path, 0);
-	if (!expanded)
-		return error(_("could not expand include path '%s'"), path);
+	if (!expanded) {
+		ret = error(_("could not expand include path '%s'"), path);
+		goto cleanup;
+	}
 	path = expanded;
 
 	/*
@@ -149,8 +151,10 @@ static int handle_path_include(const char *path, struct config_include_data *inc
 	if (!is_absolute_path(path)) {
 		char *slash;
 
-		if (!cf || !cf->path)
-			return error(_("relative config includes must come from files"));
+		if (!cf || !cf->path) {
+			ret = error(_("relative config includes must come from files"));
+			goto cleanup;
+		}
 
 		slash = find_last_dir_sep(cf->path);
 		if (slash)
@@ -168,6 +172,7 @@ static int handle_path_include(const char *path, struct config_include_data *inc
 		ret = git_config_from_file(git_config_include, path, inc);
 		inc->depth--;
 	}
+cleanup:
 	strbuf_release(&buf);
 	free(expanded);
 	return ret;
@@ -1331,8 +1336,10 @@ static int git_default_core_config(const char *var, const char *value, void *cb)
 	if (!strcmp(var, "core.attributesfile"))
 		return git_config_pathname(&git_attributes_file, var, value);
 
-	if (!strcmp(var, "core.hookspath"))
+	if (!strcmp(var, "core.hookspath")) {
+		UNLEAK(git_hooks_path);
 		return git_config_pathname(&git_hooks_path, var, value);
+	}
 
 	if (!strcmp(var, "core.bare")) {
 		is_bare_repository_cfg = git_config_bool(var, value);
diff --git a/t/t1300-config.sh b/t/t1300-config.sh
index 9ff46f3b04..93ad0f4887 100755
--- a/t/t1300-config.sh
+++ b/t/t1300-config.sh
@@ -1050,12 +1050,16 @@ test_expect_success SYMLINKS 'symlink to nonexistent configuration' '
 	test_must_fail git config --file=linktolinktonada --list
 '
 
-test_expect_success 'check split_cmdline return' "
-	git config alias.split-cmdline-fix 'echo \"' &&
-	test_must_fail git split-cmdline-fix &&
+test_expect_success 'setup check split_cmdline return' "
 	echo foo > foo &&
 	git add foo &&
-	git commit -m 'initial commit' &&
+	git commit -m 'initial commit'
+"
+
+test_expect_success !SANITIZE_LEAK 'check split_cmdline return' "
+	git config alias.split-cmdline-fix 'echo \"' &&
+	test_must_fail git split-cmdline-fix &&
+
 	git config branch.main.mergeoptions 'echo \"' &&
 	test_must_fail git merge main
 "
@@ -1101,7 +1105,7 @@ test_expect_success 'key sanity-checking' '
 	git config foo."ba =z".bar false
 '
 
-test_expect_success 'git -c works with aliases of builtins' '
+test_expect_success !SANITIZE_LEAK 'git -c works with aliases of builtins' '
 	git config alias.checkconfig "-c foo.check=bar config foo.check" &&
 	echo bar >expect &&
 	git checkconfig >actual &&
@@ -1397,7 +1401,7 @@ test_expect_success 'git --config-env with missing value' '
 	grep "invalid config format: config" error
 '
 
-test_expect_success 'git --config-env fails with invalid parameters' '
+test_expect_success !SANITIZE_LEAK 'git --config-env fails with invalid parameters' '
 	test_must_fail git --config-env=foo.flag config --bool foo.flag 2>error &&
 	test_i18ngrep "invalid config format: foo.flag" error &&
 	test_must_fail git --config-env=foo.flag= config --bool foo.flag 2>error &&
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 9201510e16..98e20950c3 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1370,6 +1370,7 @@ maybe_skip_all_sanitize_leak () {
 	add_sanitize_leak_true 't000*'
 	add_sanitize_leak_true 't001*'
 	add_sanitize_leak_true 't006*'
+	add_sanitize_leak_true 't13*config*'
 
 	# Blacklist patterns (overrides whitelist)
 	add_sanitize_leak_false 't000[469]*'
-- 
2.32.0.853.g5a570c9bf9