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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42890C5B57D for ; Wed, 3 Jul 2019 02:16:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0EC9A2187F for ; Wed, 3 Jul 2019 02:16:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562120187; bh=XuULE2W5LNN8hF80bdQNe3UzqVbSKA2dya2PvImWKUw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=1EhfAuzRW2hHq3AxqeP9LN6Xb7H1M8xUwJUnRi2ZcrwQrhCWXE6P8fD8lxGwIB7KP vaekgP2fglAv2aEJAJltka4n+BlSK1YyOLrgREMkbQSrDUMCAmt43LqPLclYPuwCS0 v6Q8f3MkhdaUh9u5T42auLjgBIDr6O2fKwwaqs+c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727936AbfGCCQ0 (ORCPT ); Tue, 2 Jul 2019 22:16:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:54712 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727895AbfGCCQX (ORCPT ); Tue, 2 Jul 2019 22:16:23 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 505B121881; Wed, 3 Jul 2019 02:16:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562120183; bh=XuULE2W5LNN8hF80bdQNe3UzqVbSKA2dya2PvImWKUw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lZnh/vSCKELIgOhTFLbaVy4VfUvA2QR2ACd8bOR99zA3wHl8i5NU0zkb/flSepJw8 PLxOpHEKLMY94MHCCJF1qUYU6nFp2FAPDVSQ2BeqTozYjW5/kkDLx8The5bNZf1WQK itzMJYYr6UO+gcLFZ6bKahjGZhouTC6+5OtkHiMg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Vinod Koul , Andrew Morton , Bjorn Andersson , Randy Dunlap , Linus Torvalds , Sasha Levin Subject: [PATCH AUTOSEL 5.1 39/39] linux/kernel.h: fix overflow for DIV_ROUND_UP_ULL Date: Tue, 2 Jul 2019 22:15:14 -0400 Message-Id: <20190703021514.17727-39-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190703021514.17727-1-sashal@kernel.org> References: <20190703021514.17727-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vinod Koul [ Upstream commit 8f9fab480c7a87b10bb5440b5555f370272a5d59 ] DIV_ROUND_UP_ULL adds the two arguments and then invokes DIV_ROUND_DOWN_ULL. But on a 32bit system the addition of two 32 bit values can overflow. DIV_ROUND_DOWN_ULL does it correctly and stashes the addition into a unsigned long long so cast the result to unsigned long long here to avoid the overflow condition. [akpm@linux-foundation.org: DIV_ROUND_UP_ULL must be an rval] Link: http://lkml.kernel.org/r/20190625100518.30753-1-vkoul@kernel.org Signed-off-by: Vinod Koul Reviewed-by: Andrew Morton Cc: Bjorn Andersson Cc: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- include/linux/kernel.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 2d14e21c16c0..4330cecd2237 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -92,7 +92,8 @@ #define DIV_ROUND_DOWN_ULL(ll, d) \ ({ unsigned long long _tmp = (ll); do_div(_tmp, d); _tmp; }) -#define DIV_ROUND_UP_ULL(ll, d) DIV_ROUND_DOWN_ULL((ll) + (d) - 1, (d)) +#define DIV_ROUND_UP_ULL(ll, d) \ + DIV_ROUND_DOWN_ULL((unsigned long long)(ll) + (d) - 1, (d)) #if BITS_PER_LONG == 32 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d) -- 2.20.1