From: Martin Sebor <msebor@gmail.com>
To: libc-alpha@sourceware.org
Subject: [PATCH v2 0/5] avoid -Wuse-after-free [BZ #26779]
Date: Mon, 24 Jan 2022 17:52:30 -0700 [thread overview]
Message-ID: <53f20975-a2c9-674d-2a43-b1b323ee545c@gmail.com> (raw)
In-Reply-To: <c9f4a1b4-193e-986c-bc21-5866b9e62e16@gmail.com>
This is a repost of the original patch but broken down by source
file and with some suppression done by #pragma GCC diagnostic
instead of conversion to intptr_t. It also adds fixes for
the same problem in the test suite that I overlooked before.
On 1/15/22 17:21, Martin Sebor wrote:
> GCC 12 features a couple of new warnings designed to detect uses
> of pointers made invalid by the pointees lifetimes having ended.
> Building Glibc with the enhanced GCC exposes a few such uses,
> mostly after successful calls to realloc. The attached patch
> avoids the new warnings by converting the pointers to uintptr_t
> first and using the converted integers instead.
>
> The patch suppresses all instances of the warning at the strictest
> setting (-Wuse-after-free=3), which includes even uses in equality
> expressions. The default setting approved for GCC 12 is
> -Wuse-after-free=2, which doesn't warn on such uses to accommodate
> the pointer-adjustment-after-realloc idiom. At the default setting,
> the changes to ldconfig.c and setenv are not necessary.
>
> Martin
next prev parent reply other threads:[~2022-01-25 0:52 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-16 0:21 [PATCH] " Martin Sebor
2022-01-16 2:25 ` Paul Eggert
2022-01-21 23:14 ` Martin Sebor
2022-01-22 0:42 ` Paul Eggert
2022-01-25 0:42 ` Martin Sebor
2022-01-25 1:08 ` Jeff Law
2022-01-18 9:48 ` Florian Weimer
2022-01-20 21:50 ` Martin Sebor
2022-01-25 0:52 ` Martin Sebor [this message]
2022-01-25 0:57 ` [PATCH v2 1/5] " Martin Sebor
2022-01-25 17:46 ` Carlos O'Donell
2022-01-25 0:58 ` [PATCH v2 2/5] " Martin Sebor
2022-01-25 17:46 ` Carlos O'Donell
2022-01-25 0:58 ` [PATCH v2 3/5] " Martin Sebor
2022-01-25 17:47 ` Carlos O'Donell
2022-01-25 0:58 ` [PATCH v2 4/5] " Martin Sebor
2022-01-25 17:49 ` Carlos O'Donell
2022-01-25 17:51 ` Carlos O'Donell
2022-01-25 21:47 ` Florian Weimer
2022-01-26 13:55 ` Carlos O'Donell
2022-01-25 0:58 ` [PATCH v2 5/5] " Martin Sebor
2022-01-25 17:49 ` Carlos O'Donell
2022-01-25 22:50 ` [PATCH v3 " Martin Sebor
2022-01-26 14:56 ` Carlos O'Donell
2022-01-28 13:10 ` Joseph Myers
2022-01-28 17:33 ` Carlos O'Donell
2022-01-28 17:51 ` Joseph Myers
2022-01-28 23:21 ` Jeff Law
2022-01-31 15:12 ` Carlos O'Donell
2022-02-04 20:40 ` Joseph Myers
2022-01-25 17:46 ` [PATCH v2 0/5] " Carlos O'Donell
2022-01-26 3:08 ` Martin Sebor
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