From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39973C433F5 for ; Tue, 28 Sep 2021 14:43:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 19C23611CE for ; Tue, 28 Sep 2021 14:43:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241381AbhI1Oo4 (ORCPT ); Tue, 28 Sep 2021 10:44:56 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:19209 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241152AbhI1Ooz (ORCPT ); Tue, 28 Sep 2021 10:44:55 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1632840196; h=Date: Message-Id: Cc: To: References: In-Reply-To: From: Subject: Content-Transfer-Encoding: MIME-Version: Content-Type: Sender; bh=1dZzT/O2EuqvWRhXR4fqGlJ/ncH11bxKPNZw5IankD8=; b=bwEKKEQGDt6aH4Ytyinf/rWtlHf+OfaZQv8l6a8KUuu6A8mo13sIcr7p0G6njUzZ5Rzxjc2B U7/gqIwiKQo30NMQCRqtf4t3xJQkaY7pWDxxakzN8DHxx0iXPRrZTQtYca2kCHtQVVoM7N81 7IaANT77ctSY7ERv/K4N69LLEqE= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyJiZjI2MiIsICJuZXRkZXZAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n06.prod.us-east-1.postgun.com with SMTP id 615329e0713d5d6f966a019a (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Tue, 28 Sep 2021 14:42:40 GMT Sender: kvalo=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 8FE35C4361A; Tue, 28 Sep 2021 14:42:39 +0000 (UTC) Received: from tykki.adurom.net (tynnyri.adurom.net [51.15.11.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: kvalo) by smtp.codeaurora.org (Postfix) with ESMTPSA id 9294AC4338F; Tue, 28 Sep 2021 14:42:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org 9294AC4338F Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=codeaurora.org Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: Re: [PATCH] mwifiex: avoid null-pointer-subtraction warning From: Kalle Valo In-Reply-To: <20210927121656.940304-1-arnd@kernel.org> References: <20210927121656.940304-1-arnd@kernel.org> To: Arnd Bergmann Cc: Amitkumar Karwar , Ganapathi Bhat , Sharvari Harisangam , Xinming Hu , Arnd Bergmann , "David S. Miller" , Jakub Kicinski , Nathan Chancellor , Nick Desaulniers , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev User-Agent: pwcli/0.1.0-git (https://github.com/kvalo/pwcli/) Python/3.7.3 Message-Id: <20210928144239.8FE35C4361A@smtp.codeaurora.org> Date: Tue, 28 Sep 2021 14:42:39 +0000 (UTC) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Arnd Bergmann wrote: > From: Arnd Bergmann > > clang complains about some NULL pointer arithmetic in this driver: > > drivers/net/wireless/marvell/mwifiex/sta_tx.c:65:59: error: performing pointer subtraction with a null pointer has undefined behavior [-Werror,-Wnull-pointer-subtraction] > pad = ((void *)skb->data - (sizeof(*local_tx_pd) + hroom)- > ^ > drivers/net/wireless/marvell/mwifiex/uap_txrx.c:478:53: error: performing pointer subtraction with a null pointer has undefined behavior [-Werror,-Wnull-pointer-subtraction] > pad = ((void *)skb->data - (sizeof(*txpd) + hroom) - NULL) & > > Rework that expression to do the same thing using a uintptr_t. > > Signed-off-by: Arnd Bergmann Patch applied to wireless-drivers.git, thanks. 603a1621caa0 mwifiex: avoid null-pointer-subtraction warning -- https://patchwork.kernel.org/project/linux-wireless/patch/20210927121656.940304-1-arnd@kernel.org/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches