From: Simon Horman <simon.horman@corigine.com>
To: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Felix Fietkau <nbd@nbd.name>,
Lorenzo Bianconi <lorenzo@kernel.org>,
Ryder Lee <ryder.lee@mediatek.com>,
Shayne Chen <shayne.chen@mediatek.com>,
Sean Wang <sean.wang@mediatek.com>, Kalle Valo <kvalo@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH][next] wifi: mt76: Replace zero-length array with flexible-array member
Date: Fri, 7 Apr 2023 09:23:47 +0200 [thread overview]
Message-ID: <ZC/FA/t1mzrRydD7@corigine.com> (raw)
In-Reply-To: <ZC7X7KCb+JEkPe5D@work>
On Thu, Apr 06, 2023 at 08:32:12AM -0600, Gustavo A. R. Silva wrote:
> Zero-length arrays are deprecated [1] and have to be replaced by C99
> flexible-array members.
>
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines
> on memcpy() and help to make progress towards globally enabling
> -fstrict-flex-arrays=3 [2]
>
> Link: https://github.com/KSPP/linux/issues/78 [1]
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
> ---
> drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h
> index a5e6ee4daf92..9bf4b4199ee3 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h
> +++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h
> @@ -127,7 +127,7 @@ struct mt76_connac2_mcu_rxd {
> u8 rsv1[2];
> u8 s2d_index;
>
> - u8 tlv[0];
> + u8 tlv[];
> };
>
> struct mt76_connac2_patch_hdr {
Curiously -fstrict-flex-arrays=3 didn't flag this one in my environment,
Ubuntu Lunar.
gcc-13 --version
gcc-13 (Ubuntu 13-20230320-1ubuntu1) 13.0.1 20230320 (experimental) [master r13-6759-g5194ad1958c]
Copyright (C) 2023 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
I did, however, notice some other problems reported by gcc-13 with
-fstrict-flex-arrays=3 in drivers/net/wireless/mediatek/mt76
when run against net-next wireless. I've listed them in diff format below.
Are these on your radar too?
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.h b/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.h
index 35268b0890ad..d09bb4eed1ec 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.h
@@ -24,7 +24,7 @@ struct mt7921_asar_dyn {
u8 names[4];
u8 enable;
u8 nr_tbl;
- struct mt7921_asar_dyn_limit tbl[0];
+ struct mt7921_asar_dyn_limit tbl[];
} __packed;
struct mt7921_asar_dyn_limit_v2 {
@@ -37,7 +37,7 @@ struct mt7921_asar_dyn_v2 {
u8 enable;
u8 rsvd;
u8 nr_tbl;
- struct mt7921_asar_dyn_limit_v2 tbl[0];
+ struct mt7921_asar_dyn_limit_v2 tbl[];
} __packed;
struct mt7921_asar_geo_band {
@@ -55,7 +55,7 @@ struct mt7921_asar_geo {
u8 names[4];
u8 version;
u8 nr_tbl;
- struct mt7921_asar_geo_limit tbl[0];
+ struct mt7921_asar_geo_limit tbl[];
} __packed;
struct mt7921_asar_geo_limit_v2 {
@@ -69,7 +69,7 @@ struct mt7921_asar_geo_v2 {
u8 version;
u8 rsvd;
u8 nr_tbl;
- struct mt7921_asar_geo_limit_v2 tbl[0];
+ struct mt7921_asar_geo_limit_v2 tbl[];
} __packed;
struct mt7921_asar_cl {
@@ -85,7 +85,7 @@ struct mt7921_asar_fg {
u8 rsvd;
u8 nr_flag;
u8 rsvd1;
- u8 flag[0];
+ u8 flag[];
} __packed;
struct mt7921_acpi_sar {
next prev parent reply other threads:[~2023-04-07 7:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-06 14:32 [PATCH][next] wifi: mt76: Replace zero-length array with flexible-array member Gustavo A. R. Silva
2023-04-07 7:23 ` Simon Horman [this message]
2023-04-11 18:39 ` Gustavo A. R. Silva
2023-04-17 11:28 ` Simon Horman
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