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Date: Sat, 11 Jun 2022 08:34:43 -0700
From: Stephen Hemminger <stephen@networkplumber.org>
To: David Marchand <david.marchand@redhat.com>
Cc: dev@dpdk.org, thomas@monjalon.net, ferruh.yigit@xilinx.com,
stable@dpdk.org, Marcin Wojtas <mw@semihalf.com>, Michal Krawczyk
<mk@semihalf.com>, Shai Brandes <shaibran@amazon.com>, Evgeny Schemeilin
<evgenys@amazon.com>, Igor Chauskin <igorch@amazon.com>
Subject: Re: [PATCH 04/12] net/ena: fix build with GCC 12
Message-ID: <20220611083443.0318ee73@hermes.local>
In-Reply-To: <20220518101657.1230416-5-david.marchand@redhat.com>
References: <20220518101657.1230416-1-david.marchand@redhat.com>
<20220518101657.1230416-5-david.marchand@redhat.com>
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Errors-To: stable-bounces@dpdk.org
On Wed, 18 May 2022 12:16:49 +0200
David Marchand <david.marchand@redhat.com> wrote:
> GCC 12 raises the following warning:
>=20
> In file included from ../lib/mempool/rte_mempool.h:46,
> from ../lib/mbuf/rte_mbuf.h:38,
> from ../lib/net/rte_ether.h:22,
> from ../drivers/net/ena/ena_ethdev.h:10,
> from ../drivers/net/ena/ena_rss.c:6:
> ../drivers/net/ena/ena_rss.c: In function =E2=80=98ena_rss_key_fill=E2=80=
=99:
> ../lib/eal/x86/include/rte_memcpy.h:370:9: warning: array subscript 64 is
> outside array bounds of =E2=80=98uint8_t[40]=E2=80=99 {aka =E2=80=
=98unsigned char[40]=E2=80=99}
> [-Warray-bounds]
> 370 | rte_mov32((uint8_t *)dst + 2 * 32, (const uint8_t *)src + 2 * 32);
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ../drivers/net/ena/ena_rss.c:51:24: note: while referencing =E2=80=98defa=
ult_key=E2=80=99
> 51 | static uint8_t default_key[ENA_HASH_KEY_SIZE];
> | ^~~~~~~~~~~
>=20
> This is a false positive because the copied size is checked against
> ENA_HASH_KEY_SIZE in a (build) assert.
> Silence this warning by calling memcpy with the minimal size.
>=20
> Cc: stable@dpdk.org
>=20
> Signed-off-by: David Marchand <david.marchand@redhat.com>
> ---
Acked-by: Stephen Hemminger <stephen@networkplumber.org>