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commit-graph: fix memory leak in misused string_list API 

When this code was migrated to the string_list API in
d88b14b3fd (commit-graph: use string-list API for input, 2018-06-27)
it was made to use used both STRING_LIST_INIT_NODUP and a
strbuf_detach() pattern.

Those should not be used together if string_list_clear() is expected
to free the memory, instead we need to either use STRING_LIST_INIT_DUP
with a string_list_append_nodup(), or a STRING_LIST_INIT_NODUP and
manually fiddle with the "strdup_strings" member before calling
string_list_clear(). Let's do the former.

Since "strdup_strings = 1" is set now other code might be broken by
relying on "pack_indexes" not to duplicate it strings, but that
doesn't happen. When we pass this down to write_commit_graph() that
code uses the "struct string_list" without modifying it. Let's add a
"const" to the variable to have the compiler enforce that assumption.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2022-03-04 19:32:12 +01:00 committed by Junio C Hamano
parent 8f79015111
commit 4a0479086a
3 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
builtin/commit-graph.c
View File

@ -192,7 +192,7 @@ static int git_commit_graph_write_config(const char *var, const char *value,
static int graph_write(int argc, const char **argv)
{
struct string_list pack_indexes = STRING_LIST_INIT_NODUP;
struct string_list pack_indexes = STRING_LIST_INIT_DUP;
struct strbuf buf = STRBUF_INIT;
struct oidset commits = OIDSET_INIT;
struct object_directory *odb = NULL;
@ -273,8 +273,8 @@ static int graph_write(int argc, const char **argv)
if (opts.stdin_packs) {
while (strbuf_getline(&buf, stdin) != EOF)
string_list_append(&pack_indexes,
strbuf_detach(&buf, NULL));
string_list_append_nodup(&pack_indexes,
strbuf_detach(&buf, NULL));
} else if (opts.stdin_commits) {
oidset_init(&commits, 0);
if (opts.progress)

4
commit-graph.c
View File

@ -1679,7 +1679,7 @@ int write_commit_graph_reachable(struct object_directory *odb,
}
static int fill_oids_from_packs(struct write_commit_graph_context *ctx,
struct string_list *pack_indexes)
const struct string_list *pack_indexes)
{
uint32_t i;
struct strbuf progress_title = STRBUF_INIT;
@ -2259,7 +2259,7 @@ out:
}
int write_commit_graph(struct object_directory *odb,
struct string_list *pack_indexes,
const struct string_list *const pack_indexes,
struct oidset *commits,
enum commit_graph_write_flags flags,
const struct commit_graph_opts *opts)

2
commit-graph.h
View File

@ -142,7 +142,7 @@ int write_commit_graph_reachable(struct object_directory *odb,
enum commit_graph_write_flags flags,
const struct commit_graph_opts *opts);
int write_commit_graph(struct object_directory *odb,
struct string_list *pack_indexes,
const struct string_list *pack_indexes,
struct oidset *commits,
enum commit_graph_write_flags flags,
const struct commit_graph_opts *opts);