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 C29C7C433EF for ; Mon, 25 Oct 2021 13:04:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AB7896023E for ; Mon, 25 Oct 2021 13:04:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233339AbhJYNHD (ORCPT ); Mon, 25 Oct 2021 09:07:03 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:30013 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232168AbhJYNHD (ORCPT ); Mon, 25 Oct 2021 09:07:03 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1635167081; h=Date: Message-ID: Cc: To: References: In-Reply-To: From: Subject: Content-Transfer-Encoding: MIME-Version: Content-Type: Sender; bh=kuLbeuqX9KK+/DlxCOlCZThwrFG8XXXwlh08K36ZZ5s=; b=SJZgKi1VPOf7GjGzWB2ZBJEItGKvGqLXmqpcdJ9wgYL0jDf8no8JGWnlFhHdtNggg9TiBxAX OGqGM7ErImum8D7sUku7+cNzwLzTWOnFiCSsPw6Tyw9pS2HzfXbqiLcqKijJVL+zBxvuPGZn 01Na5b2cmIXlkCUSUrqv0KR6MMI= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI3YTAwOSIsICJsaW51eC13aXJlbGVzc0B2Z2VyLmtlcm5lbC5vcmciLCAiYmU5ZTRhIl0= Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n02.prod.us-east-1.postgun.com with SMTP id 6176ab53e29a872c21537b53 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Mon, 25 Oct 2021 13:04:19 GMT Sender: kvalo=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 283CBC4338F; Mon, 25 Oct 2021 13:04:19 +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 864E6C4338F; Mon, 25 Oct 2021 13:04:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org 864E6C4338F 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] ath10k: fix invalid dma_addr_t token assignment From: Kalle Valo In-Reply-To: <20211014075153.3655910-1-arnd@kernel.org> References: <20211014075153.3655910-1-arnd@kernel.org> To: Arnd Bergmann Cc: Alagu Sankar , Arnd Bergmann , "David S. Miller" , Jakub Kicinski , Brian Norris , Wen Gong , Tamizh Chelvam , Carl Huang , Miaoqing Pan , Ben Greear , Erik Stromdahl , Fabio Estevam , ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org User-Agent: pwcli/0.1.0-git (https://github.com/kvalo/pwcli/) Python/3.7.3 Message-ID: <163516705229.3976.16508438608512725859.kvalo@codeaurora.org> Date: Mon, 25 Oct 2021 13:04:19 +0000 (UTC) Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Arnd Bergmann wrote: > Using a kernel pointer in place of a dma_addr_t token can > lead to undefined behavior if that makes it into cache > management functions. The compiler caught one such attempt > in a cast: > > drivers/net/wireless/ath/ath10k/mac.c: In function 'ath10k_add_interface': > drivers/net/wireless/ath/ath10k/mac.c:5586:47: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast] > 5586 | arvif->beacon_paddr = (dma_addr_t)arvif->beacon_buf; > | ^ > > Looking through how this gets used down the way, I'm fairly > sure that beacon_paddr is never accessed again for ATH10K_DEV_TYPE_HL > devices, and if it was accessed, that would be a bug. > > Change the assignment to use a known-invalid address token > instead, which avoids the warning and makes it easier to catch > bugs if it does end up getting used. > > Fixes: e263bdab9c0e ("ath10k: high latency fixes for beacon buffer") > Signed-off-by: Arnd Bergmann > Signed-off-by: Kalle Valo Patch applied to ath-next branch of ath.git, thanks. 937e79c67740 ath10k: fix invalid dma_addr_t token assignment -- https://patchwork.kernel.org/project/linux-wireless/patch/20211014075153.3655910-1-arnd@kernel.org/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches