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From: "sam at gentoo dot org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug network/28846] CMSG_NXTHDR may trigger -Wstrict-overflow warning
Date: Wed, 03 Aug 2022 23:11:37 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28846

--- Comment #1 from Sam James <sam at gentoo dot org> ---
>>From 9c443ac4559a47ed99859bd80d14dc4b6dd220a1 Mon Sep 17 00:00:00 2001
From: Arjun Shankar <arjun@redhat.com>
Date: Tue, 2 Aug 2022 11:10:25 +0200
Subject: [PATCH] socket: Check lengths before advancing pointer in CMSG_NXT=
HDR

The inline and library functions that the CMSG_NXTHDR macro may expand
to increment the pointer to the header before checking the stride of
the increment against available space.  Since C only allows incrementing
pointers to one past the end of an array, the increment must be done
after a length check.  This commit fixes that and includes a regression
test for CMSG_FIRSTHDR and CMSG_NXTHDR.

The Linux, Hurd, and generic headers are all changed.

Tested on Linux on armv7hl, i686, x86_64, aarch64, ppc64le, and s390x.

[BZ #28846]

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

(https://sourceware.org/git/?p=3Dglibc.git;a=3Dcommitdiff;h=3D9c443ac4559a4=
7ed99859bd80d14dc4b6dd220a1)

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