summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorElijah Newren <newren@gmail.com>2020-08-18 22:58:26 (GMT)
committerJunio C Hamano <gitster@pobox.com>2020-08-19 00:17:31 (GMT)
commiteceba5321410bbcc9e0b11e6aa479832f574eca8 (patch)
treecd31d4f411acc27ef42499dc5331c683fe022a90
parentdad4f23ce59339bb32ad9e1cc1682c696f7a724f (diff)
downloadgit-eceba5321410bbcc9e0b11e6aa479832f574eca8.zip
git-eceba5321410bbcc9e0b11e6aa479832f574eca8.tar.gz
git-eceba5321410bbcc9e0b11e6aa479832f574eca8.tar.bz2
dir: fix problematic API to avoid memory leaks
The dir structure seemed to have a number of leaks and problems around it. First I noticed that parent_hashmap and recursive_hashmap were being leaked (though Peff noticed and submitted fixes before me). Then I noticed in the previous commit that clear_directory() was only taking responsibility for a subset of fields within dir_struct, despite the fact that entries[] and ignored[] we allocated internally to dir.c. That, of course, resulted in many callers either leaking or haphazardly trying to free these arrays and their contents. Digging further, I found that despite the pretty clear documentation near the top of dir.h that folks were supposed to call clear_directory() when the user no longer needed the dir_struct, there were four callers that didn't bother doing that at all. However, two of them clearly thought about leaks since they had an UNLEAK(dir) directive, which to me suggests that the method to free the data was too unclear. I suspect the non-obviousness of the API and its holes led folks to avoid it, which then snowballed into further problems with the entries[], ignored[], parent_hashmap, and recursive_hashmap problems. Rename clear_directory() to dir_clear() to be more in line with other data structures in git, and introduce a dir_init() to handle the suggested memsetting of dir_struct to all zeroes. I hope that a name like "dir_clear()" is more clear, and that the presence of dir_init() will provide a hint to those looking at the code that they need to look for either a dir_clear() or a dir_free() and lead them to find dir_clear(). Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--builtin/add.c4
-rw-r--r--builtin/check-ignore.c4
-rw-r--r--builtin/clean.c8
-rw-r--r--builtin/grep.c3
-rw-r--r--builtin/ls-files.c4
-rw-r--r--builtin/stash.c4
-rw-r--r--dir.c9
-rw-r--r--dir.h21
-rw-r--r--merge.c3
-rw-r--r--wt-status.c4
10 files changed, 36 insertions, 28 deletions
diff --git a/builtin/add.c b/builtin/add.c
index ab39a60..b36a99e 100644
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -534,11 +534,11 @@ int cmd_add(int argc, const char **argv, const char *prefix)
die_in_unpopulated_submodule(&the_index, prefix);
die_path_inside_submodule(&the_index, &pathspec);
+ dir_init(&dir);
if (add_new_files) {
int baselen;
/* Set up the default git porcelain excludes */
- memset(&dir, 0, sizeof(dir));
if (!ignored_too) {
dir.flags |= DIR_COLLECT_IGNORED;
setup_standard_excludes(&dir);
@@ -611,7 +611,7 @@ finish:
COMMIT_LOCK | SKIP_IF_UNCHANGED))
die(_("Unable to write new index file"));
+ dir_clear(&dir);
UNLEAK(pathspec);
- UNLEAK(dir);
return exit_status;
}
diff --git a/builtin/check-ignore.c b/builtin/check-ignore.c
index ea5d0ae..3c65274 100644
--- a/builtin/check-ignore.c
+++ b/builtin/check-ignore.c
@@ -180,7 +180,7 @@ int cmd_check_ignore(int argc, const char **argv, const char *prefix)
if (!no_index && read_cache() < 0)
die(_("index file corrupt"));
- memset(&dir, 0, sizeof(dir));
+ dir_init(&dir);
setup_standard_excludes(&dir);
if (stdin_paths) {
@@ -190,7 +190,7 @@ int cmd_check_ignore(int argc, const char **argv, const char *prefix)
maybe_flush_or_die(stdout, "ignore to stdout");
}
- clear_directory(&dir);
+ dir_clear(&dir);
return !num_ignored;
}
diff --git a/builtin/clean.c b/builtin/clean.c
index 4ffe00d..e53ea52 100644
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -667,7 +667,7 @@ static int filter_by_patterns_cmd(void)
if (!confirm.len)
break;
- memset(&dir, 0, sizeof(dir));
+ dir_init(&dir);
pl = add_pattern_list(&dir, EXC_CMDL, "manual exclude");
ignore_list = strbuf_split_max(&confirm, ' ', 0);
@@ -698,7 +698,7 @@ static int filter_by_patterns_cmd(void)
}
strbuf_list_free(ignore_list);
- clear_directory(&dir);
+ dir_clear(&dir);
}
strbuf_release(&confirm);
@@ -923,7 +923,7 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
argc = parse_options(argc, argv, prefix, options, builtin_clean_usage,
0);
- memset(&dir, 0, sizeof(dir));
+ dir_init(&dir);
if (!interactive && !dry_run && !force) {
if (config_set)
die(_("clean.requireForce set to true and neither -i, -n, nor -f given; "
@@ -1021,7 +1021,7 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
string_list_append(&del_list, rel);
}
- clear_directory(&dir);
+ dir_clear(&dir);
if (interactive && del_list.nr > 0)
interactive_main_loop();
diff --git a/builtin/grep.c b/builtin/grep.c
index cee9db3..f58979b 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -693,7 +693,7 @@ static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
struct dir_struct dir;
int i, hit = 0;
- memset(&dir, 0, sizeof(dir));
+ dir_init(&dir);
if (!use_index)
dir.flags |= DIR_NO_GITLINKS;
if (exc_std)
@@ -705,6 +705,7 @@ static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
if (hit && opt->status_only)
break;
}
+ dir_clear(&dir);
return hit;
}
diff --git a/builtin/ls-files.c b/builtin/ls-files.c
index 30a4c10..c8eae89 100644
--- a/builtin/ls-files.c
+++ b/builtin/ls-files.c
@@ -584,7 +584,7 @@ int cmd_ls_files(int argc, const char **argv, const char *cmd_prefix)
if (argc == 2 && !strcmp(argv[1], "-h"))
usage_with_options(ls_files_usage, builtin_ls_files_options);
- memset(&dir, 0, sizeof(dir));
+ dir_init(&dir);
prefix = cmd_prefix;
if (prefix)
prefix_len = strlen(prefix);
@@ -688,6 +688,6 @@ int cmd_ls_files(int argc, const char **argv, const char *cmd_prefix)
return bad ? 1 : 0;
}
- UNLEAK(dir);
+ dir_clear(&dir);
return 0;
}
diff --git a/builtin/stash.c b/builtin/stash.c
index da48533..4bdfaf8 100644
--- a/builtin/stash.c
+++ b/builtin/stash.c
@@ -864,7 +864,7 @@ static int get_untracked_files(const struct pathspec *ps, int include_untracked,
int found = 0;
struct dir_struct dir;
- memset(&dir, 0, sizeof(dir));
+ dir_init(&dir);
if (include_untracked != INCLUDE_ALL_FILES)
setup_standard_excludes(&dir);
@@ -877,7 +877,7 @@ static int get_untracked_files(const struct pathspec *ps, int include_untracked,
strbuf_addch(untracked_files, '\0');
}
- clear_directory(&dir);
+ dir_clear(&dir);
return found;
}
diff --git a/dir.c b/dir.c
index aa96030..8d6c59a 100644
--- a/dir.c
+++ b/dir.c
@@ -54,6 +54,11 @@ static enum path_treatment read_directory_recursive(struct dir_struct *dir,
static int resolve_dtype(int dtype, struct index_state *istate,
const char *path, int len);
+void dir_init(struct dir_struct *dir)
+{
+ memset(dir, 0, sizeof(*dir));
+}
+
int count_slashes(const char *s)
{
int cnt = 0;
@@ -3012,7 +3017,7 @@ int remove_path(const char *name)
* Frees memory within dir which was allocated, and resets fields for further
* use. Does not free dir itself.
*/
-void clear_directory(struct dir_struct *dir)
+void dir_clear(struct dir_struct *dir)
{
int i, j;
struct exclude_list_group *group;
@@ -3045,7 +3050,7 @@ void clear_directory(struct dir_struct *dir)
}
strbuf_release(&dir->basebuf);
- memset(&dir, 0, sizeof(*dir));
+ dir_init(dir);
}
struct ondisk_untracked_cache {
diff --git a/dir.h b/dir.h
index 7d76d06..a3c40de 100644
--- a/dir.h
+++ b/dir.h
@@ -19,24 +19,23 @@
* CE_SKIP_WORKTREE marked. If you want to exclude files, make sure you have
* loaded the index first.
*
- * - Prepare `struct dir_struct dir` and clear it with `memset(&dir, 0,
- * sizeof(dir))`.
+ * - Prepare `struct dir_struct dir` using `dir_init()` function.
*
* - To add single exclude pattern, call `add_pattern_list()` and then
* `add_pattern()`.
*
* - To add patterns from a file (e.g. `.git/info/exclude`), call
- * `add_patterns_from_file()` , and/or set `dir.exclude_per_dir`. A
- * short-hand function `setup_standard_excludes()` can be used to set
- * up the standard set of exclude settings.
+ * `add_patterns_from_file()` , and/or set `dir.exclude_per_dir`.
*
- * - Set options described in the Data Structure section above.
+ * - A short-hand function `setup_standard_excludes()` can be used to set
+ * up the standard set of exclude settings, instead of manually calling
+ * the add_pattern*() family of functions.
*
- * - Call `read_directory()`.
+ * - Call `fill_directory()`.
*
- * - Use `dir.entries[]`.
+ * - Use `dir.entries[]` and `dir.ignored[]`.
*
- * - Call `clear_directory()` when the contained elements are no longer in use.
+ * - Call `dir_clear()` when the contained elements are no longer in use.
*
*/
@@ -362,6 +361,8 @@ int match_pathspec(const struct index_state *istate,
int report_path_error(const char *ps_matched, const struct pathspec *pathspec);
int within_depth(const char *name, int namelen, int depth, int max_depth);
+void dir_init(struct dir_struct *dir);
+
int fill_directory(struct dir_struct *dir,
struct index_state *istate,
const struct pathspec *pathspec);
@@ -428,7 +429,7 @@ void parse_path_pattern(const char **string, int *patternlen, unsigned *flags, i
void add_pattern(const char *string, const char *base,
int baselen, struct pattern_list *pl, int srcpos);
void clear_pattern_list(struct pattern_list *pl);
-void clear_directory(struct dir_struct *dir);
+void dir_clear(struct dir_struct *dir);
int repo_file_exists(struct repository *repo, const char *path);
int file_exists(const char *);
diff --git a/merge.c b/merge.c
index 753e461..5fb88af 100644
--- a/merge.c
+++ b/merge.c
@@ -80,8 +80,8 @@ int checkout_fast_forward(struct repository *r,
}
memset(&opts, 0, sizeof(opts));
+ dir_init(&dir);
if (overwrite_ignore) {
- memset(&dir, 0, sizeof(dir));
dir.flags |= DIR_SHOW_IGNORED;
setup_standard_excludes(&dir);
opts.dir = &dir;
@@ -102,6 +102,7 @@ int checkout_fast_forward(struct repository *r,
clear_unpack_trees_porcelain(&opts);
return -1;
}
+ dir_clear(&dir);
clear_unpack_trees_porcelain(&opts);
if (write_locked_index(r->index, &lock_file, COMMIT_LOCK))
diff --git a/wt-status.c b/wt-status.c
index c00ea3e..7ce58b8 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -703,7 +703,7 @@ static void wt_status_collect_untracked(struct wt_status *s)
if (!s->show_untracked_files)
return;
- memset(&dir, 0, sizeof(dir));
+ dir_init(&dir);
if (s->show_untracked_files != SHOW_ALL_UNTRACKED_FILES)
dir.flags |=
DIR_SHOW_OTHER_DIRECTORIES | DIR_HIDE_EMPTY_DIRECTORIES;
@@ -732,7 +732,7 @@ static void wt_status_collect_untracked(struct wt_status *s)
string_list_insert(&s->ignored, ent->name);
}
- clear_directory(&dir);
+ dir_clear(&dir);
if (advice_status_u_option)
s->untracked_in_ms = (getnanotime() - t_begin) / 1000000;