From 8dc3156373f4e02c1b1f657350ffae8ee94cbf44 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Fri, 14 Aug 2020 07:10:49 -0400 Subject: [PATCH 1/7] clear_pattern_list(): clear embedded hashmaps Commit 96cc8ab531 (sparse-checkout: use hashmaps for cone patterns, 2019-11-21) added some auxiliary hashmaps to the pattern_list struct, but they're leaked when clear_pattern_list() is called. Signed-off-by: Jeff King Acked-by: Derrick Stolee Signed-off-by: Junio C Hamano --- dir.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/dir.c b/dir.c index 1045cc9c6f..a684ce0186 100644 --- a/dir.c +++ b/dir.c @@ -916,6 +916,8 @@ void clear_pattern_list(struct pattern_list *pl) free(pl->patterns[i]); free(pl->patterns); free(pl->filebuf); + hashmap_free_entries(&pl->recursive_hashmap, struct pattern_entry, ent); + hashmap_free_entries(&pl->parent_hashmap, struct pattern_entry, ent); memset(pl, 0, sizeof(*pl)); } From 9101c8ea2db466cce6d7d419d48e0516c6118813 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Fri, 14 Aug 2020 12:14:14 -0400 Subject: [PATCH 2/7] submodule--helper: use strbuf_release() to free strbufs The prepare_to_clone_next_submodule() function has a few local-variable strbufs. We use strbuf_reset() throughout the function to reuse the buffers over and over. But at the end of the function we also use strbuf_reset() as they go out of scope, which means we end up leaking their heap buffers. This should be strbuf_release() instead. These were introduced by 48308681b0 (git submodule update: have a dedicated helper for cloning, 2016-02-29), but it doesn't seem to have the same mistake elsewhere. Likewise, I looked for other instances of the pattern in the submodule--helper file but couldn't find any. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- builtin/submodule--helper.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c index a1c75607c7..7f90770596 100644 --- a/builtin/submodule--helper.c +++ b/builtin/submodule--helper.c @@ -1747,8 +1747,8 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce, "--no-single-branch"); cleanup: - strbuf_reset(&displaypath_sb); - strbuf_reset(&sb); + strbuf_release(&displaypath_sb); + strbuf_release(&sb); if (need_free_url) free((void*)url); From c514c62a4fd8b4c4a3e2cad68fb590fce2940dc3 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Fri, 14 Aug 2020 12:14:53 -0400 Subject: [PATCH 3/7] checkout: fix leak of non-existent branch names We unconditionally write a branch name into a newly allocated buffer in new_branch_info->path, via setup_branch_path(). We then check to see if the branch exists; if not, we set that field to NULL, leaking the memory. We should take care to free() it when doing so. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- builtin/checkout.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/builtin/checkout.c b/builtin/checkout.c index af849c644f..ef85fd48ad 100644 --- a/builtin/checkout.c +++ b/builtin/checkout.c @@ -1126,8 +1126,10 @@ static void setup_new_branch_info_and_source_tree( if (!check_refname_format(new_branch_info->path, 0) && !read_ref(new_branch_info->path, &branch_rev)) oidcpy(rev, &branch_rev); - else + else { + free((char *)new_branch_info->path); new_branch_info->path = NULL; /* not an existing branch */ + } new_branch_info->commit = lookup_commit_reference_gently(the_repository, rev, 1); if (!new_branch_info->commit) { From f1de981e8b6dedccf915095792c9afbe3c989591 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Fri, 14 Aug 2020 12:17:36 -0400 Subject: [PATCH 4/7] config: fix leaks from git_config_get_string_const() There are two functions to get a single config string: - git_config_get_string() - git_config_get_string_const() One might naively think that the first one allocates a new string and the second one just points us to the internal configset storage. But in fact they both allocate a new copy; the second one exists only to avoid having to cast when using it with a const global which we never intend to free. The documentation for the function explains that clearly, but it seems I'm not alone in being surprised by this. Of 17 calls to the function, 13 of them leak the resulting value. We could obviously fix these by adding the appropriate free(). But it would be simpler still if we actually had a non-allocating way to get the string. There's git_config_get_value() but that doesn't quite do what we want. If the config key is present but is a boolean with no value (e.g., "[foo]bar" in the file), then we'll get NULL (whereas the string versions will print an error and die). So let's introduce a new variant, git_config_get_string_tmp(), that behaves as these callers expect. We need a new name because we have new semantics but the same function signature (so even if we converted the four remaining callers, topics in flight might be surprised). The "tmp" is because this value should only be held onto for a short time. In practice it's rare for us to clear and refresh the configset, invalidating the pointer, but hopefully the "tmp" makes callers think about the lifetime. In each of the converted cases here the value only needs to last within the local function or its immediate caller. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- builtin/fetch.c | 2 +- builtin/submodule--helper.c | 8 ++++---- config.c | 30 ++++++++++++++++++++++++++++++ config.h | 10 ++++++++++ connect.c | 4 ++-- editor.c | 2 +- help.c | 2 +- protocol.c | 2 +- submodule.c | 4 ++-- t/helper/test-config.c | 2 +- 10 files changed, 53 insertions(+), 13 deletions(-) diff --git a/builtin/fetch.c b/builtin/fetch.c index 82ac4be8a5..5c0e3ab084 100644 --- a/builtin/fetch.c +++ b/builtin/fetch.c @@ -645,7 +645,7 @@ static void prepare_format_display(struct ref *ref_map) struct ref *rm; const char *format = "full"; - git_config_get_string_const("fetch.output", &format); + git_config_get_string_tmp("fetch.output", &format); if (!strcasecmp(format, "full")) compact_format = 0; else if (!strcasecmp(format, "compact")) diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c index 7f90770596..acee0be638 100644 --- a/builtin/submodule--helper.c +++ b/builtin/submodule--helper.c @@ -1511,7 +1511,7 @@ static void determine_submodule_update_strategy(struct repository *r, if (parse_submodule_update_strategy(update, out) < 0) die(_("Invalid update mode '%s' for submodule path '%s'"), update, path); - } else if (!repo_config_get_string_const(r, key, &val)) { + } else if (!repo_config_get_string_tmp(r, key, &val)) { if (parse_submodule_update_strategy(val, out) < 0) die(_("Invalid update mode '%s' configured for submodule path '%s'"), val, path); @@ -1667,7 +1667,7 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce, } key = xstrfmt("submodule.%s.update", sub->name); - if (!repo_config_get_string_const(the_repository, key, &update_string)) { + if (!repo_config_get_string_tmp(the_repository, key, &update_string)) { update_type = parse_submodule_update_type(update_string); } else { update_type = sub->update_strategy.type; @@ -1690,7 +1690,7 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce, strbuf_reset(&sb); strbuf_addf(&sb, "submodule.%s.url", sub->name); - if (repo_config_get_string_const(the_repository, sb.buf, &url)) { + if (repo_config_get_string_tmp(the_repository, sb.buf, &url)) { if (starts_with_dot_slash(sub->url) || starts_with_dot_dot_slash(sub->url)) { url = compute_submodule_clone_url(sub->url); @@ -1976,7 +1976,7 @@ static const char *remote_submodule_branch(const char *path) return NULL; key = xstrfmt("submodule.%s.branch", sub->name); - if (repo_config_get_string_const(the_repository, key, &branch)) + if (repo_config_get_string_tmp(the_repository, key, &branch)) branch = sub->branch; free(key); diff --git a/config.c b/config.c index 8db9c77098..facd73d40a 100644 --- a/config.c +++ b/config.c @@ -2020,6 +2020,20 @@ int git_configset_get_string(struct config_set *cs, const char *key, char **dest return git_configset_get_string_const(cs, key, (const char **)dest); } +int git_configset_get_string_tmp(struct config_set *cs, const char *key, + const char **dest) +{ + const char *value; + if (!git_configset_get_value(cs, key, &value)) { + if (!value) + return config_error_nonbool(key); + *dest = value; + return 0; + } else { + return 1; + } +} + int git_configset_get_int(struct config_set *cs, const char *key, int *dest) { const char *value; @@ -2165,6 +2179,17 @@ int repo_config_get_string(struct repository *repo, return repo_config_get_string_const(repo, key, (const char **)dest); } +int repo_config_get_string_tmp(struct repository *repo, + const char *key, const char **dest) +{ + int ret; + git_config_check_init(repo); + ret = git_configset_get_string_tmp(repo->config, key, dest); + if (ret < 0) + git_die_config(key, NULL); + return ret; +} + int repo_config_get_int(struct repository *repo, const char *key, int *dest) { @@ -2242,6 +2267,11 @@ int git_config_get_string(const char *key, char **dest) return repo_config_get_string(the_repository, key, dest); } +int git_config_get_string_tmp(const char *key, const char **dest) +{ + return repo_config_get_string_tmp(the_repository, key, dest); +} + int git_config_get_int(const char *key, int *dest) { return repo_config_get_int(the_repository, key, dest); diff --git a/config.h b/config.h index 060874488f..a75b22e0d1 100644 --- a/config.h +++ b/config.h @@ -460,6 +460,7 @@ int git_configset_get_value(struct config_set *cs, const char *key, const char * int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest); int git_configset_get_string(struct config_set *cs, const char *key, char **dest); +int git_configset_get_string_tmp(struct config_set *cs, const char *key, const char **dest); int git_configset_get_int(struct config_set *cs, const char *key, int *dest); int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest); int git_configset_get_bool(struct config_set *cs, const char *key, int *dest); @@ -478,6 +479,8 @@ int repo_config_get_string_const(struct repository *repo, const char *key, const char **dest); int repo_config_get_string(struct repository *repo, const char *key, char **dest); +int repo_config_get_string_tmp(struct repository *repo, + const char *key, const char **dest); int repo_config_get_int(struct repository *repo, const char *key, int *dest); int repo_config_get_ulong(struct repository *repo, @@ -537,6 +540,13 @@ int git_config_get_string_const(const char *key, const char **dest); */ int git_config_get_string(const char *key, char **dest); +/** + * Similar to `git_config_get_string_const`, but does not allocate any new + * memory; on success `dest` will point to memory owned by the config + * machinery, which could be invalidated if it is discarded and reloaded. + */ +int git_config_get_string_tmp(const char *key, const char **dest); + /** * Finds and parses the value to an integer for the configuration variable * `key`. Dies on error; otherwise, stores the value of the parsed integer in diff --git a/connect.c b/connect.c index e0d5b9fee0..3a555611d6 100644 --- a/connect.c +++ b/connect.c @@ -1052,7 +1052,7 @@ static const char *get_ssh_command(void) if ((ssh = getenv("GIT_SSH_COMMAND"))) return ssh; - if (!git_config_get_string_const("core.sshcommand", &ssh)) + if (!git_config_get_string_tmp("core.sshcommand", &ssh)) return ssh; return NULL; @@ -1071,7 +1071,7 @@ static void override_ssh_variant(enum ssh_variant *ssh_variant) { const char *variant = getenv("GIT_SSH_VARIANT"); - if (!variant && git_config_get_string_const("ssh.variant", &variant)) + if (!variant && git_config_get_string_tmp("ssh.variant", &variant)) return; if (!strcmp(variant, "auto")) diff --git a/editor.c b/editor.c index 91989ee8a1..6303ae0ab0 100644 --- a/editor.c +++ b/editor.c @@ -40,7 +40,7 @@ const char *git_sequence_editor(void) const char *editor = getenv("GIT_SEQUENCE_EDITOR"); if (!editor) - git_config_get_string_const("sequence.editor", &editor); + git_config_get_string_tmp("sequence.editor", &editor); if (!editor) editor = git_editor(); diff --git a/help.c b/help.c index 44cee69c11..d41c36a242 100644 --- a/help.c +++ b/help.c @@ -375,7 +375,7 @@ void list_cmds_by_config(struct string_list *list) { const char *cmd_list; - if (git_config_get_string_const("completion.commands", &cmd_list)) + if (git_config_get_string_tmp("completion.commands", &cmd_list)) return; string_list_sort(list); diff --git a/protocol.c b/protocol.c index d1dd3424bb..8d964fc65e 100644 --- a/protocol.c +++ b/protocol.c @@ -21,7 +21,7 @@ enum protocol_version get_protocol_version_config(void) const char *git_test_k = "GIT_TEST_PROTOCOL_VERSION"; const char *git_test_v; - if (!git_config_get_string_const("protocol.version", &value)) { + if (!git_config_get_string_tmp("protocol.version", &value)) { enum protocol_version version = parse_protocol_version(value); if (version == protocol_unknown_version) diff --git a/submodule.c b/submodule.c index e2ef5698c8..842903c07d 100644 --- a/submodule.c +++ b/submodule.c @@ -194,7 +194,7 @@ void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt, char *key; key = xstrfmt("submodule.%s.ignore", submodule->name); - if (repo_config_get_string_const(the_repository, key, &ignore)) + if (repo_config_get_string_tmp(the_repository, key, &ignore)) ignore = submodule->ignore; free(key); @@ -1299,7 +1299,7 @@ static int get_fetch_recurse_config(const struct submodule *submodule, int fetch_recurse = submodule->fetch_recurse; key = xstrfmt("submodule.%s.fetchRecurseSubmodules", submodule->name); - if (!repo_config_get_string_const(spf->r, key, &value)) { + if (!repo_config_get_string_tmp(spf->r, key, &value)) { fetch_recurse = parse_fetch_recurse_submodules_arg(key, value); } free(key); diff --git a/t/helper/test-config.c b/t/helper/test-config.c index 234c722b48..a6e936721f 100644 --- a/t/helper/test-config.c +++ b/t/helper/test-config.c @@ -126,7 +126,7 @@ int cmd__config(int argc, const char **argv) goto exit1; } } else if (argc == 3 && !strcmp(argv[1], "get_string")) { - if (!git_config_get_string_const(argv[2], &v)) { + if (!git_config_get_string_tmp(argv[2], &v)) { printf("%s\n", v); goto exit0; } else { From 9a53219f69bd470053cf93c3f4d2a77b6d4df3e5 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Mon, 17 Aug 2020 17:33:11 -0400 Subject: [PATCH 5/7] config: drop git_config_get_string_const() As evidenced by the leak fixes in the previous commit, the "const" in git_config_get_string_const() clearly misleads people into thinking that it does not allocate a copy of the string. We can fix this by renaming it, but it's easier still to just drop it. Of the four remaining callers: - The one in git_config_parse_expiry() still needs to allocate, since that's what its callers expect. We can just use the non-const version and cast our pointer. Slightly ugly, but the damage is contained in one spot. - The two in apply are writing to global "const char *" variables, and need to continue allocating. We often mark these as const because we assign default string literals to them. But in this case we don't do that, so we can just declare them as real "char *" pointers and use the non-const version. - The call in checkout doesn't actually need a copy; it can just use the non-allocating "tmp" version of the function. The function is also mentioned in the MyFirstContribution document. We can swap that call out for the non-allocating "tmp" variant, which fits well in the example given. We'll drop the "configset" and "repo" variants, as well (which are unused). Note that this frees up the "const" name, so we could rename the "tmp" variant back to that. But let's give some time for topics in flight to adapt to the new code before doing so (if we do it too soon, the function semantics will change but the compiler won't alert us). Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- Documentation/MyFirstContribution.txt | 4 ++-- apply.c | 4 ++-- cache.h | 4 ++-- checkout.c | 3 +-- config.c | 33 +++++++-------------------- config.h | 11 +-------- environment.c | 4 ++-- 7 files changed, 18 insertions(+), 45 deletions(-) diff --git a/Documentation/MyFirstContribution.txt b/Documentation/MyFirstContribution.txt index d85c9b5143..4f85a089ef 100644 --- a/Documentation/MyFirstContribution.txt +++ b/Documentation/MyFirstContribution.txt @@ -319,14 +319,14 @@ function body: ... git_config(git_default_config, NULL); - if (git_config_get_string_const("user.name", &cfg_name) > 0) + if (git_config_get_string_tmp("user.name", &cfg_name) > 0) printf(_("No name is found in config\n")); else printf(_("Your name: %s\n"), cfg_name); ---- `git_config()` will grab the configuration from config files known to Git and -apply standard precedence rules. `git_config_get_string_const()` will look up +apply standard precedence rules. `git_config_get_string_tmp()` will look up a specific key ("user.name") and give you the value. There are a number of single-key lookup functions like this one; you can see them all (and more info about how to use `git_config()`) in `Documentation/technical/api-config.txt`. diff --git a/apply.c b/apply.c index 8bff604dbe..b212d665b2 100644 --- a/apply.c +++ b/apply.c @@ -30,8 +30,8 @@ struct gitdiff_data { static void git_apply_config(void) { - git_config_get_string_const("apply.whitespace", &apply_default_whitespace); - git_config_get_string_const("apply.ignorewhitespace", &apply_default_ignorewhitespace); + git_config_get_string("apply.whitespace", &apply_default_whitespace); + git_config_get_string("apply.ignorewhitespace", &apply_default_ignorewhitespace); git_config(git_xmerge_config, NULL); } diff --git a/cache.h b/cache.h index 654426460c..1dcf462595 100644 --- a/cache.h +++ b/cache.h @@ -921,8 +921,8 @@ extern int assume_unchanged; extern int prefer_symlink_refs; extern int warn_ambiguous_refs; extern int warn_on_object_refname_ambiguity; -extern const char *apply_default_whitespace; -extern const char *apply_default_ignorewhitespace; +extern char *apply_default_whitespace; +extern char *apply_default_ignorewhitespace; extern const char *git_attributes_file; extern const char *git_hooks_path; extern int zlib_compression_level; diff --git a/checkout.c b/checkout.c index c72e9f9773..6586e30ca5 100644 --- a/checkout.c +++ b/checkout.c @@ -47,7 +47,7 @@ const char *unique_tracking_name(const char *name, struct object_id *oid, { struct tracking_name_data cb_data = TRACKING_NAME_DATA_INIT; const char *default_remote = NULL; - if (!git_config_get_string_const("checkout.defaultremote", &default_remote)) + if (!git_config_get_string_tmp("checkout.defaultremote", &default_remote)) cb_data.default_remote = default_remote; cb_data.src_ref = xstrfmt("refs/heads/%s", name); cb_data.dst_oid = oid; @@ -55,7 +55,6 @@ const char *unique_tracking_name(const char *name, struct object_id *oid, if (dwim_remotes_matched) *dwim_remotes_matched = cb_data.num_matches; free(cb_data.src_ref); - free((char *)default_remote); if (cb_data.num_matches == 1) { free(cb_data.default_dst_ref); free(cb_data.default_dst_oid); diff --git a/config.c b/config.c index facd73d40a..d92321a279 100644 --- a/config.c +++ b/config.c @@ -2006,20 +2006,15 @@ const struct string_list *git_configset_get_value_multi(struct config_set *cs, c return e ? &e->value_list : NULL; } -int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest) +int git_configset_get_string(struct config_set *cs, const char *key, char **dest) { const char *value; if (!git_configset_get_value(cs, key, &value)) - return git_config_string(dest, key, value); + return git_config_string((const char **)dest, key, value); else return 1; } -int git_configset_get_string(struct config_set *cs, const char *key, char **dest) -{ - return git_configset_get_string_const(cs, key, (const char **)dest); -} - int git_configset_get_string_tmp(struct config_set *cs, const char *key, const char **dest) { @@ -2161,22 +2156,15 @@ const struct string_list *repo_config_get_value_multi(struct repository *repo, return git_configset_get_value_multi(repo->config, key); } -int repo_config_get_string_const(struct repository *repo, - const char *key, const char **dest) -{ - int ret; - git_config_check_init(repo); - ret = git_configset_get_string_const(repo->config, key, dest); - if (ret < 0) - git_die_config(key, NULL); - return ret; -} - int repo_config_get_string(struct repository *repo, const char *key, char **dest) { + int ret; git_config_check_init(repo); - return repo_config_get_string_const(repo, key, (const char **)dest); + ret = git_configset_get_string(repo->config, key, dest); + if (ret < 0) + git_die_config(key, NULL); + return ret; } int repo_config_get_string_tmp(struct repository *repo, @@ -2257,11 +2245,6 @@ const struct string_list *git_config_get_value_multi(const char *key) return repo_config_get_value_multi(the_repository, key); } -int git_config_get_string_const(const char *key, const char **dest) -{ - return repo_config_get_string_const(the_repository, key, dest); -} - int git_config_get_string(const char *key, char **dest) { return repo_config_get_string(the_repository, key, dest); @@ -2304,7 +2287,7 @@ int git_config_get_pathname(const char *key, const char **dest) int git_config_get_expiry(const char *key, const char **output) { - int ret = git_config_get_string_const(key, output); + int ret = git_config_get_string(key, (char **)output); if (ret) return ret; if (strcmp(*output, "now")) { diff --git a/config.h b/config.h index a75b22e0d1..91cdfbfb41 100644 --- a/config.h +++ b/config.h @@ -458,7 +458,6 @@ void git_configset_clear(struct config_set *cs); */ int git_configset_get_value(struct config_set *cs, const char *key, const char **dest); -int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest); int git_configset_get_string(struct config_set *cs, const char *key, char **dest); int git_configset_get_string_tmp(struct config_set *cs, const char *key, const char **dest); int git_configset_get_int(struct config_set *cs, const char *key, int *dest); @@ -475,8 +474,6 @@ int repo_config_get_value(struct repository *repo, const char *key, const char **value); const struct string_list *repo_config_get_value_multi(struct repository *repo, const char *key); -int repo_config_get_string_const(struct repository *repo, - const char *key, const char **dest); int repo_config_get_string(struct repository *repo, const char *key, char **dest); int repo_config_get_string_tmp(struct repository *repo, @@ -532,16 +529,10 @@ void git_config_clear(void); * error message and returns -1. When the configuration variable `key` is * not found, returns 1 without touching `dest`. */ -int git_config_get_string_const(const char *key, const char **dest); - -/** - * Similar to `git_config_get_string_const`, except that retrieved value - * copied into the `dest` parameter is a mutable string. - */ int git_config_get_string(const char *key, char **dest); /** - * Similar to `git_config_get_string_const`, but does not allocate any new + * Similar to `git_config_get_string`, but does not allocate any new * memory; on success `dest` will point to memory owned by the config * machinery, which could be invalidated if it is discarded and reloaded. */ diff --git a/environment.c b/environment.c index aaca0e91ac..ecb0c46f0d 100644 --- a/environment.c +++ b/environment.c @@ -35,8 +35,8 @@ int repository_format_precious_objects; int repository_format_worktree_config; const char *git_commit_encoding; const char *git_log_output_encoding; -const char *apply_default_whitespace; -const char *apply_default_ignorewhitespace; +char *apply_default_whitespace; +char *apply_default_ignorewhitespace; const char *git_attributes_file; const char *git_hooks_path; int zlib_compression_level = Z_BEST_SPEED; From 1c890016a147536e4a6faa5664eedd8765a01b32 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Mon, 17 Aug 2020 17:33:13 -0400 Subject: [PATCH 6/7] config: fix leak in git_config_get_expiry_in_days() We use git_config_get_string() to retrieve the expiry value in a newly allocated string. But after parsing it, we never free it, leaking the memory. We could fix this with a free() obviously, but there's an even better solution: we can use the non-allocating "tmp" variant of the function; we only need it to be valid for the lifetime of our parse function. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- config.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/config.c b/config.c index d92321a279..82c6552d86 100644 --- a/config.c +++ b/config.c @@ -2300,11 +2300,11 @@ int git_config_get_expiry(const char *key, const char **output) int git_config_get_expiry_in_days(const char *key, timestamp_t *expiry, timestamp_t now) { - char *expiry_string; + const char *expiry_string; intmax_t days; timestamp_t when; - if (git_config_get_string(key, &expiry_string)) + if (git_config_get_string_tmp(key, &expiry_string)) return 1; /* no such thing */ if (git_parse_signed(expiry_string, &days, maximum_signed_value_of_type(int))) { From 55fe225dde455ae32b9bc963bef4aabb9f5f7c3e Mon Sep 17 00:00:00 2001 From: Jeff King Date: Mon, 17 Aug 2020 17:33:16 -0400 Subject: [PATCH 7/7] submodule--helper: fix leak of core.worktree value In the ensure_core_worktree() function, we load the core.worktree value of the submodule repository using repo_config_get_string(). This function copies the string, but we never free it, leaking the memory. We can instead use the "tmp" version of that function to avoid the allocation at all. We don't have to worry about lifetime issues, since we never even look at the value (we just want to know if it's set). Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- builtin/submodule--helper.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c index acee0be638..b6c22aecf4 100644 --- a/builtin/submodule--helper.c +++ b/builtin/submodule--helper.c @@ -2101,7 +2101,7 @@ static int ensure_core_worktree(int argc, const char **argv, const char *prefix) { const struct submodule *sub; const char *path; - char *cw; + const char *cw; struct repository subrepo; if (argc != 2) @@ -2116,7 +2116,7 @@ static int ensure_core_worktree(int argc, const char **argv, const char *prefix) if (repo_submodule_init(&subrepo, the_repository, sub)) die(_("could not get a repository handle for submodule '%s'"), path); - if (!repo_config_get_string(&subrepo, "core.worktree", &cw)) { + if (!repo_config_get_string_tmp(&subrepo, "core.worktree", &cw)) { char *cfg_file, *abs_path; const char *rel_path; struct strbuf sb = STRBUF_INIT;