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 46FACC433F5 for ; Tue, 16 Nov 2021 01:08:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2AF7360F14 for ; Tue, 16 Nov 2021 01:08:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350257AbhKPBLg (ORCPT ); Mon, 15 Nov 2021 20:11:36 -0500 Received: from mail.kernel.org ([198.145.29.99]:44642 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245415AbhKOTUc (ORCPT ); Mon, 15 Nov 2021 14:20:32 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 95A6363276; Mon, 15 Nov 2021 18:34:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637001247; bh=870ZaPlWckwXfWen7shlPE1msodNXCEhW1Zq3eCLlPI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TTShyamowau3GBLtai0bCMVifcLzymNFIf9Op59kL713qJOuomPczaM+MnJC39Lpt qvdSRnFE95r7p4ORF2u8K3TXJPwQVoRVYt2S0VjuOOxJgkRTC8Zirio0vtymXXx4fs 9WYkAP7mK78gC7IHsA041Vh1HLsyFhBppZ/gCXsk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sebastian Krzyszkowiak , Krzysztof Kozlowski , Sebastian Reichel Subject: [PATCH 5.15 117/917] power: supply: max17042_battery: Prevent int underflow in set_soc_threshold Date: Mon, 15 Nov 2021 17:53:32 +0100 Message-Id: <20211115165432.717899454@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165428.722074685@linuxfoundation.org> References: <20211115165428.722074685@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sebastian Krzyszkowiak commit e660dbb68c6b3f7b9eb8b9775846a44f9798b719 upstream. max17042_set_soc_threshold gets called with offset set to 1, which means that minimum threshold value would underflow once SOC got down to 0, causing invalid alerts from the gauge. Fixes: e5f3872d2044 ("max17042: Add support for signalling change in SOC") Cc: Signed-off-by: Sebastian Krzyszkowiak Reviewed-by: Krzysztof Kozlowski Signed-off-by: Sebastian Reichel Signed-off-by: Greg Kroah-Hartman --- drivers/power/supply/max17042_battery.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/power/supply/max17042_battery.c +++ b/drivers/power/supply/max17042_battery.c @@ -857,7 +857,8 @@ static void max17042_set_soc_threshold(s regmap_read(map, MAX17042_RepSOC, &soc); soc >>= 8; soc_tr = (soc + off) << 8; - soc_tr |= (soc - off); + if (off < soc) + soc_tr |= soc - off; regmap_write(map, MAX17042_SALRT_Th, soc_tr); }