Subject: [PATCH 00/26] Memory leak fixes (pt.10, final)

From: Patrick Steinhardt <[email-masked]>
Date: Wed, 6 Nov 2024 16:10:14 +0100

Hi,

this is the last part of my series of memory leak fixes. This series
goes a bit further than past series:

  - Patches 1 to 16 plug remaining memory leaks exposed by our test
    suite.

  - Patches 17 to 21 remove the last remaining `UNLEAK()` annotations
    and ultimately remove the macro itself.

  - Patch 22 works around a bug in the leak sanitizer itself.

  - Patches 23 and 24 drop annotations where leak-free tests pass with
    the leak sanitizer.

  - Patches 25 and 26 unconditionally enable leak checking in all newly
    added tests and then drop the `TEST_PASSES_SANITIZE_LEAK`
    annotation.

So once this series lands, the expectation is that any newly added test
needs to be leak free by default. We still have an escape hatch in the
form of the SANITIZE_LEAK prerequisite, but patch authors are expected
to provide good arguments why their test cannot be made leak free.

This series is built on top of 8f8d6eee53 (The seventh batch,
2024-11-01) with ps/leakfixes-part-9 at c810549be1
(list-objects-filter-options: work around reported leak on error,
2024-11-05) merged into it.

The series has some trivial conflicts with the removed test annotations
when merging with `seen`. There are two topics in-flight that introduce
new memory leaks (ds/path-walk and cc/promisor-remote-capability), both
of which are fixed by the below patch. I've sent a message in response
to the individual commits that introduce the leaks.

Thanks!

Patrick

diff --git a/promisor-remote.c b/promisor-remote.c
index 06507b2ee1..0a4f7f1188 100644
--- a/promisor-remote.c
+++ b/promisor-remote.c
@@ -424,12 +424,12 @@ static void filter_promisor_remote(struct repository *repo,
 				   const char *info)
 {
 	struct strbuf **remotes;
-	char *accept_str;
+	const char *accept_str;
 	enum accept_promisor accept = ACCEPT_NONE;
 	struct strvec names = STRVEC_INIT;
 	struct strvec urls = STRVEC_INIT;
 
-	if (!git_config_get_string("promisor.acceptfromserver", &accept_str)) {
+	if (!git_config_get_string_tmp("promisor.acceptfromserver", &accept_str)) {
 		if (!accept_str || !*accept_str || !strcasecmp("None", accept_str))
 			accept = ACCEPT_NONE;
 		else if (!strcasecmp("KnownUrl", accept_str))
@@ -486,7 +486,6 @@ static void filter_promisor_remote(struct repository *repo,
 		free(decoded_url);
 	}
 
-	free(accept_str);
 	strvec_clear(&names);
 	strvec_clear(&urls);
 	strbuf_list_free(remotes);
diff --git a/t/helper/test-path-walk.c b/t/helper/test-path-walk.c
index 06b103d876..fa3bfe46b5 100644
--- a/t/helper/test-path-walk.c
+++ b/t/helper/test-path-walk.c
@@ -85,7 +85,6 @@ int cmd__path_walk(int argc, const char **argv)
 		OPT_END(),
 	};
 
-	initialize_repository(the_repository);
 	setup_git_directory();
 	revs.repo = the_repository;
 
@@ -110,5 +109,6 @@ int cmd__path_walk(int argc, const char **argv)
 	       "tags:%" PRIuMAX "\n",
 	       data.commit_nr, data.tree_nr, data.blob_nr, data.tag_nr);
 
+	release_revisions(&revs);
 	return res;
 }

Patrick Steinhardt (26):
  builtin/blame: fix leaking blame entries with `--incremental`
  bisect: fix leaking good/bad terms when reading multipe times
  bisect: fix leaking string in `handle_bad_merge_base()`
  bisect: fix leaking `current_bad_oid`
  bisect: fix multiple leaks in `bisect_next_all()`
  bisect: fix leaking commit list items in `check_merge_base()`
  bisect: fix various cases where we leak commit list items
  line-log: fix leak when rewriting commit parents
  strvec: introduce new `strvec_splice()` function
  git: refactor alias handling to use a `struct strvec`
  git: refactor builtin handling to use a `struct strvec`
  split-index: fix memory leak in `move_cache_to_base_index()`
  builtin/sparse-checkout: fix leaking sanitized patterns
  help: refactor to not use globals for reading config
  help: fix leaking `struct cmdnames`
  help: fix leaking return value from `help_unknown_cmd()`
  builtin/help: fix leaks in `check_git_cmd()`
  builtin/init-db: fix leaking directory paths
  builtin/branch: fix leaking sorting options
  t/helper: fix leaking commit graph in "read-graph" subcommand
  git-compat-util: drop `UNLEAK()` annotation
  t5601: work around leak sanitizer issue
  t: mark some tests as leak free
  t: remove unneeded !SANITIZE_LEAK prerequisites
  test-lib: unconditionally enable leak checking
  t: remove TEST_PASSES_SANITIZE_LEAK annotations

 bisect.c                                      |  61 ++++++---
 bisect.h                                      |   2 +-
 blame.c                                       |   1 +
 blame.h                                       |   2 +-
 builtin/blame.c                               |  12 +-
 builtin/branch.c                              |  33 +++--
 builtin/clone.c                               |   1 -
 builtin/diff.c                                |   1 -
 builtin/help.c                                |  13 +-
 builtin/init-db.c                             |  30 +++--
 builtin/sparse-checkout.c                     |  61 +++++----
 ci/lib.sh                                     |   1 -
 git-compat-util.h                             |  20 ---
 git.c                                         | 124 +++++++++---------
 help.c                                        |  76 ++++++-----
 help.h                                        |   2 +-
 line-log.c                                    |   1 +
 revision.c                                    |   4 +-
 split-index.c                                 |   6 +-
 strvec.c                                      |  19 +++
 strvec.h                                      |   9 ++
 t/README                                      |  21 ---
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 t/test-lib.sh                                 |  72 +---------
 t/unit-tests/strvec.c                         |  65 +++++++++
 usage.c                                       |  15 ---
 950 files changed, 376 insertions(+), 1253 deletions(-)

-- 
2.47.0.229.g8f8d6eee53.dirty