builtin/repack: fix leaking configuration

When repacking, we assemble git-pack-objects(1) arguments both for the
"normal" pack and for the cruft pack. This configuration gets populated
with a bunch of `OPT_PASSTHRU` options that we end up passing to the
child process. These options are allocated, but never free'd.

Create a new `pack_objects_args_release()` function that releases the
memory for us and call it for both sets of options.

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

Author: pks-t

builtin/repack.c

@@ -85,17 +85,34 @@ static int repack_config(const char *var, const char *value,
 		run_update_server_info = git_config_bool(var, value);
 		return 0;
 	}
-	if (!strcmp(var, "repack.cruftwindow"))
+	if (!strcmp(var, "repack.cruftwindow")) {
+		free(cruft_po_args->window);
 		return git_config_string(&cruft_po_args->window, var, value);
-	if (!strcmp(var, "repack.cruftwindowmemory"))
+	}
+	if (!strcmp(var, "repack.cruftwindowmemory")) {
+		free(cruft_po_args->window_memory);
 		return git_config_string(&cruft_po_args->window_memory, var, value);
-	if (!strcmp(var, "repack.cruftdepth"))
+	}
+	if (!strcmp(var, "repack.cruftdepth")) {
+		free(cruft_po_args->depth);
 		return git_config_string(&cruft_po_args->depth, var, value);
-	if (!strcmp(var, "repack.cruftthreads"))
+	}
+	if (!strcmp(var, "repack.cruftthreads")) {
+		free(cruft_po_args->threads);
 		return git_config_string(&cruft_po_args->threads, var, value);
+	}
 	return git_default_config(var, value, ctx, cb);
 }
 
+static void pack_objects_args_release(struct pack_objects_args *args)
+{
+	free(args->window);
+	free(args->window_memory);
+	free(args->depth);
+	free(args->threads);
+	list_objects_filter_release(&args->filter_options);
+}
+
 struct existing_packs {
 	struct string_list kept_packs;
 	struct string_list non_kept_packs;
@@ -1152,12 +1169,16 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	const char *unpack_unreachable = NULL;
 	int keep_unreachable = 0;
 	struct string_list keep_pack_list = STRING_LIST_INIT_NODUP;
-	struct pack_objects_args po_args = {NULL};
-	struct pack_objects_args cruft_po_args = {NULL};
+	struct pack_objects_args po_args = { 0 };
+	struct pack_objects_args cruft_po_args = { 0 };
 	int write_midx = 0;
 	const char *cruft_expiration = NULL;
 	const char *expire_to = NULL;
 	const char *filter_to = NULL;
+	const char *opt_window = NULL;
+	const char *opt_window_memory = NULL;
+	const char *opt_depth = NULL;
+	const char *opt_threads = NULL;
 
 	struct option builtin_repack_options[] = {
 		OPT_BIT('a', NULL, &pack_everything,
@@ -1191,13 +1212,13 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 				N_("with -A, do not loosen objects older than this")),
 		OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
 				N_("with -a, repack unreachable objects")),
-		OPT_STRING(0, "window", &po_args.window, N_("n"),
+		OPT_STRING(0, "window", &opt_window, N_("n"),
 				N_("size of the window used for delta compression")),
-		OPT_STRING(0, "window-memory", &po_args.window_memory, N_("bytes"),
+		OPT_STRING(0, "window-memory", &opt_window_memory, N_("bytes"),
 				N_("same as the above, but limit memory size instead of entries count")),
-		OPT_STRING(0, "depth", &po_args.depth, N_("n"),
+		OPT_STRING(0, "depth", &opt_depth, N_("n"),
 				N_("limits the maximum delta depth")),
-		OPT_STRING(0, "threads", &po_args.threads, N_("n"),
+		OPT_STRING(0, "threads", &opt_threads, N_("n"),
 				N_("limits the maximum number of threads")),
 		OPT_MAGNITUDE(0, "max-pack-size", &po_args.max_pack_size,
 				N_("maximum size of each packfile")),
@@ -1224,6 +1245,11 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix, builtin_repack_options,
 				git_repack_usage, 0);
 
+	po_args.window = xstrdup_or_null(opt_window);
+	po_args.window_memory = xstrdup_or_null(opt_window_memory);
+	po_args.depth = xstrdup_or_null(opt_depth);
+	po_args.threads = xstrdup_or_null(opt_threads);
+
 	if (delete_redundant && repository_format_precious_objects)
 		die(_("cannot delete packs in a precious-objects repo"));
 
@@ -1389,13 +1415,13 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 		const char *pack_prefix = find_pack_prefix(packdir, packtmp);
 
 		if (!cruft_po_args.window)
-			cruft_po_args.window = po_args.window;
+			cruft_po_args.window = xstrdup_or_null(po_args.window);
 		if (!cruft_po_args.window_memory)
-			cruft_po_args.window_memory = po_args.window_memory;
+			cruft_po_args.window_memory = xstrdup_or_null(po_args.window_memory);
 		if (!cruft_po_args.depth)
-			cruft_po_args.depth = po_args.depth;
+			cruft_po_args.depth = xstrdup_or_null(po_args.depth);
 		if (!cruft_po_args.threads)
-			cruft_po_args.threads = po_args.threads;
+			cruft_po_args.threads = xstrdup_or_null(po_args.threads);
 		if (!cruft_po_args.max_pack_size)
 			cruft_po_args.max_pack_size = po_args.max_pack_size;
 
@@ -1547,7 +1573,8 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	string_list_clear(&names, 1);
 	existing_packs_release(&existing);
 	free_pack_geometry(&geometry);
-	list_objects_filter_release(&po_args.filter_options);
+	pack_objects_args_release(&po_args);
+	pack_objects_args_release(&cruft_po_args);
 
 	return ret;
 }

t/t5329-pack-objects-cruft.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='cruft pack related pack-objects tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 objdir=.git/objects

t/t7700-repack.sh

@@ -2,6 +2,7 @@
 
 test_description='git repack works correctly'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "${TEST_DIRECTORY}/lib-bitmap.sh"
 . "${TEST_DIRECTORY}/lib-midx.sh"