From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 87DE3210195; Mon, 27 May 2024 14:18:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716819508; cv=none; b=qbKdIzaJHegUUDE9LIfGsheq8niqrTZFWNFS21cwkn9ozlKRb+sQqmQihh3lpsbt+66kDSVMrmARsHCHe7qBBgZqF0LGB4O2ElAT1VV5a3D+dpcrsWiq56Mai0TbaPr8I/308Vblj+bNXELRtabHzw8f/A3/7PjSSs5RO3mX7Ko= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716819508; c=relaxed/simple; bh=Nc1h0iROXLAYstYCLiGlzYQ1+t0FEGMu+q++HSBtj4U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=TrEUa7m74tUTTIVz0IcAXwNsUDeyDcEWdjltY09GuyD3xaCtYJP6rusKZH1nmHLHU1YDRQHC+MBFGUHb4Y1gvz9JwK6EK3urBVtT15NgnDrdeVdRSiVuxw2rg1JJBmRdKeCfcljpoM/OCa88C3aHMcpdZFhSdyYdGi4j4KB3Gnc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aFb2ODGM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aFb2ODGM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 589B3C32781; Mon, 27 May 2024 14:18:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716819508; bh=Nc1h0iROXLAYstYCLiGlzYQ1+t0FEGMu+q++HSBtj4U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aFb2ODGM49gX2HJPbGP3c33scw/2N6AL7SRwc/HkIZl0cQ3gdDkROLmz75GIUjtGR N7ATa5uM4k1r27EtdyQMoFlmMb+4ghLAOS7Aiqsr1jipCMTn5wLphwm6YacRrNKsu7 qVEjm4P6mJiYLedCo9eb6zDqv3ykgwytnW/keRUVBn4YAQTgylTsbXG15QiEP3rxuM daiUKHLQZMTyXPYtytOaI7DB74t1Pi6DK4JEfttUqEL1/BZlSaM9UUzxkZVnUJK+SQ cngekjLrlGiIdKIxeGVv2Xj7RpzrJta9JCPj7cOQKaXCyGX54sm2q5k8cz9kns83gr 3pVhQi+ohjlgw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Arnd Bergmann , =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , Kees Cook , Kalle Valo , Sasha Levin , kvalo@kernel.org, linux-wireless@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 04/13] wifi: ath9k: work around memset overflow warning Date: Mon, 27 May 2024 10:17:58 -0400 Message-ID: <20240527141819.3854376-4-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240527141819.3854376-1-sashal@kernel.org> References: <20240527141819.3854376-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.160 Content-Transfer-Encoding: 8bit From: Arnd Bergmann [ Upstream commit 61752ac69b69ed2e04444d090f6917c77ab36d42 ] gcc-9 and some other older versions produce a false-positive warning for zeroing two fields In file included from include/linux/string.h:369, from drivers/net/wireless/ath/ath9k/main.c:18: In function 'fortify_memset_chk', inlined from 'ath9k_ps_wakeup' at drivers/net/wireless/ath/ath9k/main.c:140:3: include/linux/fortify-string.h:462:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning] 462 | __write_overflow_field(p_size_field, size); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Using a struct_group seems to reliably avoid the warning and not make the code much uglier. The combined memset() should even save a couple of cpu cycles. Signed-off-by: Arnd Bergmann Acked-by: Toke Høiland-Jørgensen Reviewed-by: Kees Cook Signed-off-by: Kalle Valo Link: https://msgid.link/20240328135509.3755090-3-arnd@kernel.org Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/ath.h | 6 ++++-- drivers/net/wireless/ath/ath9k/main.c | 3 +-- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h index f02a308a9ffc5..34654f710d8a1 100644 --- a/drivers/net/wireless/ath/ath.h +++ b/drivers/net/wireless/ath/ath.h @@ -171,8 +171,10 @@ struct ath_common { unsigned int clockrate; spinlock_t cc_lock; - struct ath_cycle_counters cc_ani; - struct ath_cycle_counters cc_survey; + struct_group(cc, + struct ath_cycle_counters cc_ani; + struct ath_cycle_counters cc_survey; + ); struct ath_regulatory regulatory; struct ath_regulatory reg_world_copy; diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index 9e6d088bd2818..1b71fb1d04719 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -135,8 +135,7 @@ void ath9k_ps_wakeup(struct ath_softc *sc) if (power_mode != ATH9K_PM_AWAKE) { spin_lock(&common->cc_lock); ath_hw_cycle_counters_update(common); - memset(&common->cc_survey, 0, sizeof(common->cc_survey)); - memset(&common->cc_ani, 0, sizeof(common->cc_ani)); + memset(&common->cc, 0, sizeof(common->cc)); spin_unlock(&common->cc_lock); } -- 2.43.0