From: Jeff King <peff@peff.net>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
"Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>,
git@vger.kernel.org,
"Johannes Schindelin" <johannes.schindelin@gmx.de>
Subject: Re: [PATCH 11/11] bug_fl(): add missing `va_end()` call
Date: Thu, 16 Jun 2022 15:20:08 -0400 [thread overview]
Message-ID: <YquCaE+Vw9P/fybU@coredump.intra.peff.net> (raw)
In-Reply-To: <xmqqk09gtriq.fsf@gitster.g>
On Thu, Jun 16, 2022 at 11:03:25AM -0700, Junio C Hamano wrote:
> Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
>
> > But obviously that's a bad use of the varargs API, I just don't know how
> > we've been getting away with it in practice, sorry about that.
>
> Exactly. We three all expressed our surprises on why it "works".
> Nobody offered an explanation, though, which leaves us in suspense
> ;-)
Being the curious sort, I ran it in a debugger. And indeed, "cp" is
filled with uninitialized garbage. The reason it works is that the test
calls bug() with a format string that does not contain any placeholders.
And thus our eventual call to vsnprintf() does not ever look at "cp" at
all!
> > The fix Peff's got here LGTM. I can (re)submit it with
> > format-patch+send-email after giving it a commit message describing the
> > issue if you'd like, but the change would be the same.
>
> Yup, I think the code change there looks the most sensible.
I'll wrap it up with a commit message and modify the test to be more
thorough.
-Peff
next prev parent reply other threads:[~2022-06-16 19:22 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-15 23:35 [PATCH 00/11] Coverity fixes Johannes Schindelin via GitGitGadget
2022-06-15 23:35 ` [PATCH 01/11] mingw: avoid accessing uninitialized memory in `is_executable()` Johannes Schindelin via GitGitGadget
2022-06-16 4:07 ` Junio C Hamano
2022-06-16 19:53 ` René Scharfe
2022-06-16 20:13 ` Junio C Hamano
2022-06-16 20:20 ` Junio C Hamano
2022-06-15 23:35 ` [PATCH 02/11] fsmonitor: avoid memory leak in `fsm_settings__get_incompatible_msg()` Johannes Schindelin via GitGitGadget
2022-06-16 4:10 ` Junio C Hamano
2022-06-15 23:35 ` [PATCH 03/11] submodule--helper: avoid memory leak in `update_submodule()` Johannes Schindelin via GitGitGadget
2022-06-16 4:23 ` Junio C Hamano
2022-06-16 17:51 ` Glen Choo
2022-06-15 23:35 ` [PATCH 04/11] get_oid_with_context_1(): avoid use-after-free Johannes Schindelin via GitGitGadget
2022-06-16 4:29 ` Junio C Hamano
2022-06-15 23:35 ` [PATCH 05/11] submodule-config: avoid memory leak Johannes Schindelin via GitGitGadget
2022-06-16 4:36 ` Junio C Hamano
2022-06-16 18:09 ` Glen Choo
2022-06-15 23:35 ` [PATCH 06/11] pack-redundant: avoid using uninitialized memory Johannes Schindelin via GitGitGadget
2022-06-16 4:53 ` Junio C Hamano
2022-06-15 23:35 ` [PATCH 07/11] submodule--helper: avoid memory leak when fetching submodules Johannes Schindelin via GitGitGadget
2022-06-16 4:55 ` Junio C Hamano
2022-06-15 23:35 ` [PATCH 08/11] read_index_from(): avoid memory leak Johannes Schindelin via GitGitGadget
2022-06-17 21:27 ` Tom Levy
2022-06-15 23:35 ` [PATCH 09/11] pack-mtimes: avoid closing a bogus file descriptor Johannes Schindelin via GitGitGadget
2022-06-16 20:43 ` Taylor Blau
2022-06-15 23:35 ` [PATCH 10/11] relative_url(): fix incorrect condition Johannes Schindelin via GitGitGadget
2022-06-16 5:02 ` Junio C Hamano
2022-06-16 13:09 ` Ævar Arnfjörð Bjarmason
2022-06-16 17:55 ` Junio C Hamano
2022-06-16 16:41 ` Junio C Hamano
2022-06-15 23:35 ` [PATCH 11/11] bug_fl(): add missing `va_end()` call Johannes Schindelin via GitGitGadget
2022-06-16 4:53 ` Jeff King
2022-06-16 5:00 ` Junio C Hamano
2022-06-16 13:02 ` Ævar Arnfjörð Bjarmason
2022-06-16 18:03 ` Junio C Hamano
2022-06-16 19:20 ` Jeff King [this message]
2022-06-16 20:04 ` [PATCH] bug_fl(): correctly initialize trace2 va_list Jeff King
2022-06-16 20:11 ` [PATCH 11/11] bug_fl(): add missing `va_end()` call Junio C Hamano
2022-06-16 4:05 ` [PATCH 00/11] Coverity fixes Junio C Hamano
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YquCaE+Vw9P/fybU@coredump.intra.peff.net \
--to=peff@peff.net \
--cc=avarab@gmail.com \
--cc=git@vger.kernel.org \
--cc=gitgitgadget@gmail.com \
--cc=gitster@pobox.com \
--cc=johannes.schindelin@gmx.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).