From patchwork Fri Feb 9 18:31:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Erick Archer X-Patchwork-Id: 13551730 Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) (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 1842D5478B; Fri, 9 Feb 2024 18:32:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=212.227.17.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707503524; cv=none; b=VpCFGtC4oYGfnYGBQyH2ZOpQooci5z8CORgE5UoETg3kSdv8nubLZzTm25OGCOgJPR4oAVp6kS8ecOWyq9oKBc54nhO+fTVFnimnGyW5WT9Unnestpjs3yQei1JMzS1toL+9EuVEjSfDY9dKeuN6GW5Lan5qUvrsFlUu6pu0sO0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707503524; c=relaxed/simple; bh=Lm6QEmxYFtHMAzQ013WgLkguXgBWkgyz8h5irU3s7uk=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=bIV34MBImjLgXQ0ggiSfoWqJ5Oi2h8BIwZKkVnFHBdp3WOsDBlUAbnGc7BYFOIcKdKHuVPCPSuWcR1pnF36eVrFD20byUJnz2WKXxnGU5qt5gYmmBW7ygqKy8bY4DxYneRQjvEUkFLBpWCf0uI2Y/de7wAkATJwbQkqlHCCG9t0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.com; spf=pass smtp.mailfrom=gmx.com; dkim=pass (2048-bit key) header.d=gmx.com header.i=erick.archer@gmx.com header.b=IjUxgM1K; arc=none smtp.client-ip=212.227.17.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmx.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmx.com header.i=erick.archer@gmx.com header.b="IjUxgM1K" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.com; s=s31663417; t=1707503503; x=1708108303; i=erick.archer@gmx.com; bh=Lm6QEmxYFtHMAzQ013WgLkguXgBWkgyz8h5irU3s7uk=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date; b=IjUxgM1KUEA4+SU/oU9vYEvsUSF5P1uUmsqB/zO1mJUdY/RDcF7J9EZKrO/SMsXV X6G8iPpPThxtYswAbSlMmyVhn8/sMxxcfRPHi+8xVls2ZuR6HtygWdkNgdE1gbxqa W/zhKX53UV7mulnMLeNP/Qh6YT+nvHyunaCkzwddL3jXeezPaF0xICRRveQfuRhIk 36KB43DxddnP10FmErLekxV12FixzvJS19FwQmjJXO/oVCpCuO0fSzxzo0dFRN02t UBp1wfqFGN25PU6ceNcdHjpOmZBEThXOHafTOvH0CEYE48Uq75gZlcL+SWHwAwYIq idEEbLGbe4Uu3pD2Ww== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from localhost.localdomain ([79.157.194.183]) by mail.gmx.net (mrgmx105 [212.227.17.174]) with ESMTPSA (Nemesis) id 1Mof57-1rF61e0PM1-00p27r; Fri, 09 Feb 2024 19:31:43 +0100 From: Erick Archer To: Florian Fainelli , Thomas Gleixner , "Gustavo A. R. Silva" Cc: Erick Archer , linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, Broadcom internal kernel review list , linux-arm-kernel@lists.infradead.org, linux-hardening@vger.kernel.org Subject: [PATCH] irqchip/irq-bcm7038-l1: Prefer struct_size over open coded arithmetic Date: Fri, 9 Feb 2024 19:31:28 +0100 Message-Id: <20240209183128.10273-1-erick.archer@gmx.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Provags-ID: V03:K1:HHE2RklMAgct5mWgoo5roJAE0JNG1ajQPkAW3/w0TU9s7QMGYgc lJppmFsPQYybduHX/bzeNYbj5G4Jt1opcVxoboa+zy5EijRyvzU2sNMr6g8OnyasblpGe0/ NGfu19G/ZifHfDH7yN5YgoW2GJP13JUug+Toed+qXU3eOpPRQ7Udu+DGUDZIIviO+LpRlI8 CurrQGSZ3Uz135e/IeOwQ== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:aiXGABC/NJE=;4XdU1nSuxoQ18FFKIQEs4U+lHlc hnrMxh53rZP5AGJs/zAZa4gPYCJJ6CZAO1PNSQO6fWONDxbmN4sMcnUAmeeK7mxs0riAVEb6N +L3qsDbnW3rpyXtcPGXT6VOJv6bie+CyfGmPHYeR15B7g5siFCDLCuFcSXq28Qcil2vEz9uv/ y9xsLOFDrxfhtP6UuJhXum9NLbuTjVbE2U7juaIMj7rSKNL01m7c/uFdqO1UJlRVj21FZbZm+ wQYIj3TnTyRSkZwFdXDYKYvTdtoDd9GSgdt23Aft+z8mMwdaYS09wLqHe6ITSZbbZiJ7kKKF+ Hrhk5TwalPX1bQA1mLOmJLRsL4pzRipkBOUVNuqqRYzN2cpHT6X8yWtlhfQZQpAmvHkd0LOKj QK7iuiIrJ1UjUdH4wNwMXSaM6908KrPR24S3uK+Yc5Fz07JwyENal/qJ3GXGYpBiQpnDKNstY yENOkSpspL8S3fcXdxW/VT2YIZhPjhtXz+/yYIIAp7+e6Yxxn70glGZCJIqr9qORbsV+hYMpG Yi6qC2ljuDrr45DUNVSFjjftmGl8JxVLsL6azqLeF3SydEAhrQbxa1oYCpXiLcdDgdIdZV+RC ud86Xow3FZSyL/SwMpZy0a+zu4RuLKjKNtz7CMwSKw8Dgl702quBQQmvCiCJk9SxowOjLHEZV PcrTNjEP/8vc0YMsSXD5CwcbI481OdAmt6nlkL54O0K0+N8Oxx7B0+8L1YeQdE7qeP0YbxPrk 1at286ZydYRlE1FBe18hqvblFXsRQrL2V35i9HggNLoz3CGRsPLBjfPtZTK/sB4113VMCB9JP Nan18YywG4/5JieXd8VJG1jpKerA5Xy11E1pmMrnadea0= This is an effort to get rid of all multiplications from allocation functions in order to prevent integer overflows [1]. As the cpu variable is a pointer to "struct bcm7038_l1_cpu" and this structure ends in a flexible array: struct bcm7038_l1_cpu { void __iomem *map_base; u32 mask_cache[]; }; the preferred way in the kernel is to use the struct_size() helper to do the arithmetic instead of the argument "size + count * size" in the kzalloc() function. This way, the code is more readable and more safer. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1] Link: https://github.com/KSPP/linux/issues/162 [2] Signed-off-by: Erick Archer Reviewed-by: Gustavo A. R. Silva Reviewed-by: Kees Cook Reviewed-by: Florian Fainelli --- drivers/irqchip/irq-bcm7038-l1.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- 2.25.1 diff --git a/drivers/irqchip/irq-bcm7038-l1.c b/drivers/irqchip/irq-bcm7038-l1.c index 24ca1d656adc..36e71af054e9 100644 --- a/drivers/irqchip/irq-bcm7038-l1.c +++ b/drivers/irqchip/irq-bcm7038-l1.c @@ -249,7 +249,7 @@ static int __init bcm7038_l1_init_one(struct device_node *dn, return -EINVAL; } - cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32), + cpu = intc->cpus[idx] = kzalloc(struct_size(cpu, mask_cache, n_words), GFP_KERNEL); if (!cpu) return -ENOMEM;