From: Junio C Hamano <gitster@pobox.com>
To: Jeff King <peff@peff.net>
Cc: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>, git@vger.kernel.org
Subject: Re: [PATCH 6/6] revisions API: don't leak memory on argv elements that need free()-ing
Date: Fri, 29 Jul 2022 11:52:02 -0700 [thread overview]
Message-ID: <xmqqk07v69bh.fsf@gitster.g> (raw)
In-Reply-To: <YuQpBwUt8rAE9oym@coredump.intra.peff.net> (Jeff King's message of "Fri, 29 Jul 2022 14:37:59 -0400")
Jeff King <peff@peff.net> writes:
> The more interesting question is whether it causes any use-after-free
> bugs.
Thanks for mentioning this. All the "plug more leaks" patches make
me worried for exactly that. Another is a potential subtle breakage
hidden by use of FREE_AND_NULL() and friends, which the sanitizers
would probably not see, but can appear as behaviour change.
> I don't think it does, and certainly SANITIZE=address agrees.
;-)
> -- >8 --
> Subject: [PATCH] bisect: stop leaking strvec in bisect_rev_setup()
>
> Back when 8a534b6124 (bisect: use argv_array API, 2011-09-13) was
> written, it was not safe to free the argv we had passed to
> setup_revisions() until the actual traversal was done.
>
> But since then, we've had many cleanups that makes this safe; e.g.,
> df835d3a0c (add_rev_cmdline(): make a copy of the name argument,
> 2013-05-25) and 31faeb2088 (object_array_entry: fix memory handling of
> the name field, 2013-05-25). The comment here is now out-dated; we can
> just clear the strvec rather than leaking.
>
> Note that there's still a small leak because of the way
> setup_revisions() handles removed elements internally. That will be
> fixed in a subsequent patch.
>
> Signed-off-by: Jeff King <peff@peff.net>
> ---
> bisect.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/bisect.c b/bisect.c
> index 421470bfa5..9cce23e929 100644
> --- a/bisect.c
> +++ b/bisect.c
> @@ -670,7 +670,7 @@ static void bisect_rev_setup(struct repository *r, struct rev_info *revs,
> read_bisect_paths(&rev_argv);
>
> setup_revisions(rev_argv.nr, rev_argv.v, revs, NULL);
> - /* XXX leak rev_argv, as "revs" may still be pointing to it */
> + strvec_clear(&rev_argv);
> }
>
> static void bisect_common(struct rev_info *revs)
next prev parent reply other threads:[~2022-07-29 18:52 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-13 13:10 [PATCH 0/6] revisions API: fix more memory leaks Ævar Arnfjörð Bjarmason
2022-07-13 13:10 ` [PATCH 1/6] bisect.c: add missing "goto" for release_revisions() Ævar Arnfjörð Bjarmason
2022-07-13 13:10 ` [PATCH 2/6] test-fast-rebase helper: use release_revisions() (again) Ævar Arnfjörð Bjarmason
2022-07-13 13:10 ` [PATCH 3/6] log: make the intent of cmd_show()'s "rev.pending" juggling clearer Ævar Arnfjörð Bjarmason
2022-07-18 14:51 ` Jeff King
2022-07-13 13:10 ` [PATCH 4/6] log: fix common "rev.pending" memory leak in "git show" Ævar Arnfjörð Bjarmason
2022-07-18 14:57 ` Jeff King
2022-07-18 15:08 ` Ævar Arnfjörð Bjarmason
2022-07-13 13:10 ` [PATCH 5/6] bisect.c: partially fix bisect_rev_setup() memory leak Ævar Arnfjörð Bjarmason
2022-07-18 15:05 ` Jeff King
2022-07-13 13:10 ` [PATCH 6/6] revisions API: don't leak memory on argv elements that need free()-ing Ævar Arnfjörð Bjarmason
2022-07-18 15:11 ` Jeff King
2022-07-18 15:13 ` Ævar Arnfjörð Bjarmason
2022-07-18 15:45 ` Jeff King
2022-07-29 7:07 ` Ævar Arnfjörð Bjarmason
2022-07-29 18:03 ` Jeff King
2022-07-29 18:37 ` Jeff King
2022-07-29 18:52 ` Junio C Hamano [this message]
2022-07-29 19:04 ` Jeff King
2022-07-18 15:14 ` [PATCH 0/6] revisions API: fix more memory leaks Jeff King
2022-07-29 8:31 ` [PATCH v2 " Ævar Arnfjörð Bjarmason
2022-07-29 8:31 ` [PATCH v2 1/6] bisect.c: add missing "goto" for release_revisions() Ævar Arnfjörð Bjarmason
2022-07-29 8:31 ` [PATCH v2 2/6] test-fast-rebase helper: use release_revisions() (again) Ævar Arnfjörð Bjarmason
2022-07-30 5:22 ` Eric Sunshine
2022-07-29 8:31 ` [PATCH v2 3/6] log: make the intent of cmd_show()'s "rev.pending" juggling clearer Ævar Arnfjörð Bjarmason
2022-07-29 18:44 ` Junio C Hamano
2022-07-29 8:31 ` [PATCH v2 4/6] log: fix common "rev.pending" memory leak in "git show" Ævar Arnfjörð Bjarmason
2022-07-29 18:55 ` Jeff King
2022-07-29 19:07 ` Jeff King
2022-07-29 18:59 ` Jeff King
2022-07-29 8:31 ` [PATCH v2 5/6] bisect.c: partially fix bisect_rev_setup() memory leak Ævar Arnfjörð Bjarmason
2022-07-29 8:31 ` [PATCH v2 6/6] revisions API: don't leak memory on argv elements that need free()-ing Ævar Arnfjörð Bjarmason
2022-07-29 19:00 ` Jeff King
2022-07-29 19:02 ` [PATCH v2 0/6] revisions API: fix more memory leaks Jeff King
2022-08-02 15:33 ` [PATCH v3 " Ævar Arnfjörð Bjarmason
2022-08-02 15:33 ` [PATCH v3 1/6] bisect.c: add missing "goto" for release_revisions() Ævar Arnfjörð Bjarmason
2022-08-03 17:13 ` Junio C Hamano
2022-08-02 15:33 ` [PATCH v3 2/6] test-fast-rebase helper: use release_revisions() (again) Ævar Arnfjörð Bjarmason
2022-08-02 15:33 ` [PATCH v3 3/6] log: fix a memory leak in "git show <revision>..." Ævar Arnfjörð Bjarmason
2022-08-03 17:27 ` Jeff King
2022-08-03 17:29 ` Jeff King
2022-08-03 17:54 ` Junio C Hamano
2022-08-02 15:33 ` [PATCH v3 4/6] log: refactor "rev.pending" code in cmd_show() Ævar Arnfjörð Bjarmason
2022-08-03 17:32 ` Jeff King
2022-08-03 17:59 ` Junio C Hamano
2022-08-04 7:51 ` Ævar Arnfjörð Bjarmason
2022-08-04 15:59 ` Junio C Hamano
2022-08-05 9:01 ` Ævar Arnfjörð Bjarmason
2022-08-02 15:33 ` [PATCH v3 5/6] bisect.c: partially fix bisect_rev_setup() memory leak Ævar Arnfjörð Bjarmason
2022-08-02 15:33 ` [PATCH v3 6/6] revisions API: don't leak memory on argv elements that need free()-ing Ævar Arnfjörð Bjarmason
2022-08-03 18:30 ` Junio C Hamano
2022-08-03 17:33 ` [PATCH v3 0/6] revisions API: fix more memory leaks Jeff King
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