From: Phillip Wood <phillip.wood123@gmail.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>, git@vger.kernel.org
Cc: "Johannes Schindelin" <Johannes.Schindelin@gmx.de>,
"Junio C Hamano" <gitster@pobox.com>,
"Taylor Blau" <me@ttaylorr.com>, "René Scharfe" <l.s.r@web.de>
Subject: Re: [PATCH 08/10] sequencer.c: always free() the "msgbuf" in do_pick_commit()
Date: Sat, 31 Dec 2022 15:03:39 +0000 [thread overview]
Message-ID: <bcace50b-a4c3-c468-94a3-4fe0c62b3671@dunelm.org.uk> (raw)
In-Reply-To: <patch-08.10-d607dbac38e-20221230T071741Z-avarab@gmail.com>
Hi Ævar
On 30/12/2022 07:28, Ævar Arnfjörð Bjarmason wrote:
> In [1] the strbuf_release(&msgbuf) was moved into this
> do_pick_commit(), but didn't take into account the case of [2], where
> we'd return before the strbuf_release(&msgbuf).
>
> Then when the "fixup" support was added in [3] this leak got worse, as
> we added another place where we'd "return" before reaching the
> strbuf_release().
This message makes it sound much worse that it is. The leak only happens
if there is an error and in that case rebase bails out straight away.
> Let's move it to a "cleanup" label, and use an appropriate "goto". It
> may or may not be safe to combine the existing "leave" and "cleanup"
> labels, but this change doesn't attempt to answer that question. Let's
> instead avoid calling update_abort_safety_file() in these cases, as we
> didn't do so before.
It is safe as update_abort_safety_file() is a no-op when rebasing and
you're changing code that is only run when rebasing. I feel this patch
is adding complexity for no real gain, at least if we can avoid adding a
second label it would be simpler.
Best Wishes
Phillip
> 1. 452202c74b8 (sequencer: stop releasing the strbuf in
> write_message(), 2016-10-21)
> 2. f241ff0d0a9 (prepare the builtins for a libified merge_recursive(),
> 2016-07-26)
> 3. 6e98de72c03 (sequencer (rebase -i): add support for the 'fixup' and
> 'squash' commands, 2017-01-02)
>
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
> ---
> sequencer.c | 19 ++++++++++++-------
> 1 file changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/sequencer.c b/sequencer.c
> index 47367e66842..db8d789fa76 100644
> --- a/sequencer.c
> +++ b/sequencer.c
> @@ -2280,8 +2280,10 @@ static int do_pick_commit(struct repository *r,
> reword = 1;
> else if (is_fixup(command)) {
> if (update_squash_messages(r, command, commit,
> - opts, item->flags))
> - return -1;
> + opts, item->flags)) {
> + res = -1;
> + goto cleanup;
> + }
> flags |= AMEND_MSG;
> if (!final_fixup)
> msg_file = rebase_path_squash_msg();
> @@ -2291,9 +2293,11 @@ static int do_pick_commit(struct repository *r,
> } else {
> const char *dest = git_path_squash_msg(r);
> unlink(dest);
> - if (copy_file(dest, rebase_path_squash_msg(), 0666))
> - return error(_("could not rename '%s' to '%s'"),
> - rebase_path_squash_msg(), dest);
> + if (copy_file(dest, rebase_path_squash_msg(), 0666)) {
> + res = error(_("could not rename '%s' to '%s'"),
> + rebase_path_squash_msg(), dest);
> + goto cleanup;
> + }
> unlink(git_path_merge_msg(r));
> msg_file = dest;
> flags |= EDIT_MSG;
> @@ -2331,7 +2335,6 @@ static int do_pick_commit(struct repository *r,
> free_commit_list(common);
> free_commit_list(remotes);
> }
> - strbuf_release(&msgbuf);
>
> /*
> * If the merge was clean or if it failed due to conflict, we write
> @@ -2403,9 +2406,11 @@ static int do_pick_commit(struct repository *r,
> }
>
> leave:
> + update_abort_safety_file();
> +cleanup:
> free_message(commit, &msg);
> free(author);
> - update_abort_safety_file();
> + strbuf_release(&msgbuf);
>
> return res;
> }
next prev parent reply other threads:[~2022-12-31 15:04 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-30 7:28 [PATCH 00/10] sequencer API & users: fix widespread leaks Ævar Arnfjörð Bjarmason
2022-12-30 7:28 ` [PATCH 01/10] rebase: use "cleanup" pattern in do_interactive_rebase() Ævar Arnfjörð Bjarmason
2022-12-31 14:50 ` Phillip Wood
2022-12-30 7:28 ` [PATCH 02/10] sequencer.c: split up sequencer_remove_state() Ævar Arnfjörð Bjarmason
2022-12-30 17:35 ` René Scharfe
2022-12-31 14:51 ` Phillip Wood
2022-12-30 7:28 ` [PATCH 03/10] rebase & sequencer API: fix get_replay_opts() leak in "rebase" Ævar Arnfjörð Bjarmason
2022-12-31 14:54 ` Phillip Wood
2022-12-30 7:28 ` [PATCH 04/10] builtin/revert.c: refactor run_sequencer() return pattern Ævar Arnfjörð Bjarmason
2023-01-01 4:25 ` Junio C Hamano
2022-12-30 7:28 ` [PATCH 05/10] builtin/revert.c: fix common leak by using replay_opts_release() Ævar Arnfjörð Bjarmason
2022-12-30 23:37 ` René Scharfe
2022-12-31 14:55 ` Phillip Wood
2022-12-30 7:28 ` [PATCH 06/10] builtin/revert.c: move free-ing of "revs" to replay_opts_release() Ævar Arnfjörð Bjarmason
2022-12-30 7:28 ` [PATCH 07/10] builtin/rebase.c: fix "options.onto_name" leak Ævar Arnfjörð Bjarmason
2022-12-31 14:59 ` Phillip Wood
2022-12-30 7:28 ` [PATCH 08/10] sequencer.c: always free() the "msgbuf" in do_pick_commit() Ævar Arnfjörð Bjarmason
2022-12-31 15:03 ` Phillip Wood [this message]
2022-12-30 7:28 ` [PATCH 09/10] builtin/rebase.c: free() "options.strategy_opts" Ævar Arnfjörð Bjarmason
2022-12-30 7:28 ` [PATCH 10/10] commit.c: free() revs.commit in get_fork_point() Ævar Arnfjörð Bjarmason
2022-12-31 15:06 ` [PATCH 00/10] sequencer API & users: fix widespread leaks Phillip Wood
2023-01-01 4:27 ` Junio C Hamano
2023-01-12 12:45 ` [PATCH v2 0/9] " Ævar Arnfjörð Bjarmason
2023-01-12 12:45 ` [PATCH v2 1/9] rebase: use "cleanup" pattern in do_interactive_rebase() Ævar Arnfjörð Bjarmason
2023-01-12 12:45 ` [PATCH v2 2/9] sequencer.c: split up sequencer_remove_state() Ævar Arnfjörð Bjarmason
2023-01-12 12:45 ` [PATCH v2 3/9] rebase & sequencer API: fix get_replay_opts() leak in "rebase" Ævar Arnfjörð Bjarmason
2023-01-13 10:34 ` Phillip Wood
2023-01-12 12:45 ` [PATCH v2 4/9] builtin/revert.c: move free-ing of "revs" to replay_opts_release() Ævar Arnfjörð Bjarmason
2023-01-13 10:36 ` Phillip Wood
2023-01-12 12:45 ` [PATCH v2 5/9] builtin/rebase.c: rename "squash_onto_name" to "to_free" Ævar Arnfjörð Bjarmason
2023-01-13 10:37 ` Phillip Wood
2023-01-12 12:45 ` [PATCH v2 6/9] builtin/rebase.c: fix "options.onto_name" leak Ævar Arnfjörð Bjarmason
2023-01-13 10:41 ` Phillip Wood
2023-01-12 12:45 ` [PATCH v2 7/9] sequencer.c: always free() the "msgbuf" in do_pick_commit() Ævar Arnfjörð Bjarmason
2023-01-12 12:46 ` [PATCH v2 8/9] builtin/rebase.c: free() "options.strategy_opts" Ævar Arnfjörð Bjarmason
2023-01-12 12:46 ` [PATCH v2 9/9] commit.c: free() revs.commit in get_fork_point() Ævar Arnfjörð Bjarmason
2023-01-13 10:45 ` [PATCH v2 0/9] sequencer API & users: fix widespread leaks Phillip Wood
2023-01-13 20:47 ` Junio C Hamano
2023-01-18 16:09 ` [PATCH v3 0/8] " Ævar Arnfjörð Bjarmason
2023-01-18 16:09 ` [PATCH v3 1/8] rebase: use "cleanup" pattern in do_interactive_rebase() Ævar Arnfjörð Bjarmason
2023-01-18 16:09 ` [PATCH v3 2/8] sequencer.c: split up sequencer_remove_state() Ævar Arnfjörð Bjarmason
2023-01-18 16:09 ` [PATCH v3 3/8] rebase & sequencer API: fix get_replay_opts() leak in "rebase" Ævar Arnfjörð Bjarmason
2023-01-24 14:36 ` Phillip Wood
2023-01-18 16:09 ` [PATCH v3 4/8] builtin/revert.c: move free-ing of "revs" to replay_opts_release() Ævar Arnfjörð Bjarmason
2023-01-18 16:09 ` [PATCH v3 5/8] builtin/rebase.c: fix "options.onto_name" leak Ævar Arnfjörð Bjarmason
2023-01-24 14:40 ` Phillip Wood
2023-01-18 16:09 ` [PATCH v3 6/8] sequencer.c: always free() the "msgbuf" in do_pick_commit() Ævar Arnfjörð Bjarmason
2023-01-18 16:09 ` [PATCH v3 7/8] builtin/rebase.c: free() "options.strategy_opts" Ævar Arnfjörð Bjarmason
2023-02-06 19:08 ` [PATCH v4 0/8] sequencer API & users: fix widespread leaks Ævar Arnfjörð Bjarmason
2023-02-06 19:08 ` [PATCH v4 1/8] rebase: use "cleanup" pattern in do_interactive_rebase() Ævar Arnfjörð Bjarmason
2023-02-06 19:08 ` [PATCH v4 2/8] sequencer.c: split up sequencer_remove_state() Ævar Arnfjörð Bjarmason
2023-02-06 19:08 ` [PATCH v4 3/8] sequencer API users: fix get_replay_opts() leaks Ævar Arnfjörð Bjarmason
2023-02-06 19:08 ` [PATCH v4 4/8] builtin/revert.c: move free-ing of "revs" to replay_opts_release() Ævar Arnfjörð Bjarmason
2023-02-06 19:08 ` [PATCH v4 5/8] builtin/rebase.c: fix "options.onto_name" leak Ævar Arnfjörð Bjarmason
2023-02-06 19:08 ` [PATCH v4 6/8] sequencer.c: always free() the "msgbuf" in do_pick_commit() Ævar Arnfjörð Bjarmason
2023-02-06 19:08 ` [PATCH v4 7/8] builtin/rebase.c: free() "options.strategy_opts" Ævar Arnfjörð Bjarmason
2023-02-06 19:08 ` [PATCH v4 8/8] commit.c: free() revs.commit in get_fork_point() Ævar Arnfjörð Bjarmason
2023-02-07 10:19 ` [PATCH v4 0/8] sequencer API & users: fix widespread leaks Phillip Wood
2023-01-18 16:09 ` [PATCH v3 8/8] commit.c: free() revs.commit in get_fork_point() Ævar Arnfjörð Bjarmason
2023-01-24 14:41 ` [PATCH v3 0/8] sequencer API & users: fix widespread leaks Phillip Wood
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