From: "Dmitry V. Levin" <ldv@altlinux.org>
To: elfutils-devel@sourceware.org
Subject: Re: elfutils does not compile with gcc 12.2.0
Date: Thu, 25 Aug 2022 00:01:34 +0300 [thread overview]
Message-ID: <20220824210134.GA1005@altlinux.org> (raw)
In-Reply-To: <340e1f2d-ffd6-6b28-aa5e-3d3f3a535f07@systemli.org>
On Wed, Aug 24, 2022 at 10:51:13PM +0200, Nick via Elfutils-devel wrote:
> I try to compile elfutils on OpenWrt with the newest gcc 12.2.0 version.
> However, it fails due to -Werror=use-after-free. A workaround is a patch
> that I found on the mailinglist, to disable -Werror
> (https://sourceware.org/legacy-ml/elfutils-devel/imported/msg00994.html)
> I modified it to apply to newest elfutils version. The error with
> elfutils 0.187 and gcc 12.2.0:
>
> In function 'bigger_buffer',
> inlined from '__libdw_gunzip' at gzip.c:376:12:
> gzip.c:98:9: error: pointer may be used after 'realloc'
> [-Werror=use-after-free]
> 98 | b = realloc (state->buffer, more -= 1024);
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> gzip.c:96:13: note: call to 'realloc' here
> 96 | char *b = realloc (state->buffer, more);
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This warning is definitely wrong, looks like a regression in gcc, please
report this to compiler people, otherwise they will never know they
introduced a bug that needs fixing.
--
ldv
next prev parent reply other threads:[~2022-08-24 21:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-24 20:51 Nick
2022-08-24 21:01 ` Dmitry V. Levin [this message]
2022-08-25 8:51 ` Nick
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