[PATCH v3 04/26] submodule--helper: fix a leak in "clone_submodule"

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Fix a memory leak of the "clone_data_path" variable that we copy or
derive from the "struct module_clone_data" in clone_submodule(). This
code was refactored in preceding commits, but the leak has been with
us since f8eaa0ba98b (submodule--helper, module_clone: always operate
on absolute paths, 2016-03-31).

For the "else" case we don't need to xstrdup() the "clone_data->path",
and we don't need to free our own "clone_data_path".

In the case of the module_clone() caller it's from "argv", and doesn't
need to be free'd, and in the case of the add_submodule() caller we
get a pointer to "sm_path", which doesn't need to be directly free'd
either.

Fixing this leak makes several tests pass, so let's mark them as
passing with TEST_PASSES_SANITIZE_LEAK=true.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 builtin/submodule--helper.c   | 6 ++++--
 t/t1500-rev-parse.sh          | 1 +
 t/t6008-rev-list-submodule.sh | 1 +
 t/t7414-submodule-mistakes.sh | 2 ++
 t/t7506-status-submodule.sh   | 1 +
 t/t7507-commit-verbose.sh     | 2 ++
 6 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 7d5ee6a6261..1ddce8e19c1 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1658,14 +1658,15 @@ static int clone_submodule(const struct module_clone_data *clone_data,
 	char *sm_alternate = NULL, *error_strategy = NULL;
 	struct child_process cp = CHILD_PROCESS_INIT;
 	const char *clone_data_path;
+	char *to_free = NULL;
 
 	if (!is_absolute_path(clone_data->path)) {
 		struct strbuf sb = STRBUF_INIT;
 
 		strbuf_addf(&sb, "%s/%s", get_git_work_tree(), clone_data->path);
-		clone_data_path = strbuf_detach(&sb, NULL);
+		clone_data_path = to_free = strbuf_detach(&sb, NULL);
 	} else {
-		clone_data_path = xstrdup(clone_data_path);
+		clone_data_path = clone_data->path;
 	}
 
 	if (validate_submodule_git_dir(sm_gitdir, clone_data->name) < 0)
@@ -1750,6 +1751,7 @@ static int clone_submodule(const struct module_clone_data *clone_data,
 
 	free(sm_gitdir);
 	free(p);
+	free(to_free);
 	return 0;
 }
 
diff --git a/t/t1500-rev-parse.sh b/t/t1500-rev-parse.sh
index 1c2df08333b..0e13bcb4ebb 100755
--- a/t/t1500-rev-parse.sh
+++ b/t/t1500-rev-parse.sh
@@ -4,6 +4,7 @@ test_description='test git rev-parse'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_one () {
diff --git a/t/t6008-rev-list-submodule.sh b/t/t6008-rev-list-submodule.sh
index 3153a0d8910..12e67e187ef 100755
--- a/t/t6008-rev-list-submodule.sh
+++ b/t/t6008-rev-list-submodule.sh
@@ -8,6 +8,7 @@ test_description='git rev-list involving submodules that this repo has'
 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' '
diff --git a/t/t7414-submodule-mistakes.sh b/t/t7414-submodule-mistakes.sh
index f2e7df59cf2..3269298197c 100755
--- a/t/t7414-submodule-mistakes.sh
+++ b/t/t7414-submodule-mistakes.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='handling of common mistakes people may make with submodules'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create embedded repository' '
diff --git a/t/t7506-status-submodule.sh b/t/t7506-status-submodule.sh
index 3fcb44767f5..f5426a8e589 100755
--- a/t/t7506-status-submodule.sh
+++ b/t/t7506-status-submodule.sh
@@ -2,6 +2,7 @@
 
 test_description='git status for submodule'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_create_repo_with_commit () {
diff --git a/t/t7507-commit-verbose.sh b/t/t7507-commit-verbose.sh
index ed2653d46fe..92462a22374 100755
--- a/t/t7507-commit-verbose.sh
+++ b/t/t7507-commit-verbose.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='verbose commit template'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 write_script "check-for-diff" <<\EOF &&
-- 
2.37.1.1095.g0bd6f54ba8a




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