From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 CBC061A2570; Thu, 15 Aug 2024 14:11:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723731066; cv=none; b=ae4JCYYypQz9mnDE7LVzrWJsDXt0cViczIijZe0a54T2f4peMsHRZvz69cN1eMnK/vtnVZBxR19AqCERKSkF0FNDpHbj8RWFLqoyaVXMk/iNzqbCHekAfaCJIVNmMQxVnEazhbiyVa4RbinpP0/cGLudzDGM1s0RIFUigqIisCQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723731066; c=relaxed/simple; bh=E8rJfzpLrgBtMxz+h9kz+pMH3Hb3cc/XbVn9QrucjqU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bEtRou8P86l8HGoC0g9nRckZDGqix6o9Zb8MtLx35gyp7KEomYoH1YshNZk0GksvV2aeEMmODtiPusLtTGRYVKJxnlahVa49kRgsNSSYrLWmZJwajIIGy+8YhQgTtNdEH7cK/+PBtYkVuCqNyWFOd2vwBlheyvhCD722WeCAm14= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ERa/nqQT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ERa/nqQT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E709C32786; Thu, 15 Aug 2024 14:11:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1723731066; bh=E8rJfzpLrgBtMxz+h9kz+pMH3Hb3cc/XbVn9QrucjqU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ERa/nqQTKfgsJ65LpTgrJudNGvOQzd3Oon1IA65fga4oy9/KaaDGGbhc5xS4OugKG w9NaeJ1QLRdznGg+VJpWUGo/NQXpyuddzVbSKDvLiaO4l8y5TP/h+yA294faokeKrg YSOiEaSuJiUTmwNZhB+iILhwBU4IKbe0m/PbmgSw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tzung-Bi Shih , Guenter Roeck , Sasha Levin Subject: [PATCH 5.4 013/259] hwmon: (max6697) Fix underflow when writing limit attributes Date: Thu, 15 Aug 2024 15:22:26 +0200 Message-ID: <20240815131903.305713500@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240815131902.779125794@linuxfoundation.org> References: <20240815131902.779125794@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Guenter Roeck [ Upstream commit cbf7467828cd4ec7ceac7a8b5b5ddb2f69f07b0e ] Using DIV_ROUND_CLOSEST() on an unbound value can result in underflows. Indeed, module test scripts report: temp1_max: Suspected underflow: [min=0, read 255000, written -9223372036854775808] temp1_crit: Suspected underflow: [min=0, read 255000, written -9223372036854775808] Fix by introducing an extra set of clamping. Fixes: 5372d2d71c46 ("hwmon: Driver for Maxim MAX6697 and compatibles") Reviewed-by: Tzung-Bi Shih Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/hwmon/max6697.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/hwmon/max6697.c b/drivers/hwmon/max6697.c index 64122eb38060d..cfd5815e60dfa 100644 --- a/drivers/hwmon/max6697.c +++ b/drivers/hwmon/max6697.c @@ -305,6 +305,7 @@ static ssize_t temp_store(struct device *dev, return ret; mutex_lock(&data->update_lock); + temp = clamp_val(temp, -1000000, 1000000); /* prevent underflow */ temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset; temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127); data->temp[nr][index] = temp; -- 2.43.0