sequencer API users: fix get_replay_opts() leaks

Make the replay_opts_release() function added in the preceding commit
non-static, and use it for freeing the "struct replay_opts"
constructed for "rebase" and "revert".

To safely call our new replay_opts_release() we'll need to stop
calling it in sequencer_remove_state(), and instead call it where we
allocate the "struct replay_opts" itself.

This is because in e.g. do_interactive_rebase() we construct a "struct
replay_opts" with "get_replay_opts()", and then call
"complete_action()". If we get far enough in that function without
encountering errors we'll call "pick_commits()" which (indirectly)
calls sequencer_remove_state() at the end.

But if we encounter errors anywhere along the way we'd punt out early,
and not free() the memory we allocated. Remembering whether we
previously called sequencer_remove_state() would be a hassle.

Using a FREE_AND_NULL() pattern would also work, as it would be safe
to call replay_opts_release() repeatedly. But let's fix this properly
instead, by having the owner of the data free() it.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2 files changed, 6 insertions, 0 deletions

diff --git a/builtin/rebase.c b/builtin/rebase.c
index c97ce642cf..2ec3ae0b42 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -297,6 +297,7 @@ static int do_interactive_rebase(struct rebase_options *opts, unsigned flags)
 	}
 
 cleanup:
+	replay_opts_release(&replay);
 	free(revisions);
 	free(shortrevisions);
 	todo_list_release(&todo_list);
@@ -338,6 +339,7 @@ static int run_sequencer_rebase(struct rebase_options *opts)
 		struct replay_opts replay_opts = get_replay_opts(opts);
 
 		ret = sequencer_continue(the_repository, &replay_opts);
+		replay_opts_release(&replay_opts);
 		break;
 	}
 	case ACTION_EDIT_TODO:
@@ -553,6 +555,7 @@ static int finish_rebase(struct rebase_options *opts)
 
 		replay.action = REPLAY_INTERACTIVE_REBASE;
 		ret = sequencer_remove_state(&replay);
+		replay_opts_release(&replay);
 	} else {
 		strbuf_addstr(&dir, opts->state_dir);
 		if (remove_dir_recursively(&dir, 0))
@@ -1324,6 +1327,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 
 			replay.action = REPLAY_INTERACTIVE_REBASE;
 			ret = sequencer_remove_state(&replay);
+			replay_opts_release(&replay);
 		} else {
 			strbuf_reset(&buf);
 			strbuf_addstr(&buf, options.state_dir);
diff --git a/builtin/revert.c b/builtin/revert.c
index f2d86d2a8f..1cab16bf3e 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -251,6 +251,7 @@ int cmd_revert(int argc, const char **argv, const char *prefix)
 	if (opts.revs)
 		release_revisions(opts.revs);
 	free(opts.revs);
+	replay_opts_release(&opts);
 	return res;
 }
 
@@ -267,5 +268,6 @@ int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
 	free(opts.revs);
 	if (res < 0)
 		die(_("cherry-pick failed"));
+	replay_opts_release(&opts);
 	return res;
 }