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 C7D1D18FC93; Tue, 10 Sep 2024 10:21:51 +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=1725963711; cv=none; b=EStm3L0M8jXCubn25+E3CD8e/Empxh8a4C8oQf/GuLPMdMoAstwyUVbkiueAfbBst85l0oI7GAdNzxBmckRqhe/AfDfWu2Otzlbm53mp/AuI7OaN9FONppNr5KQwVRBZNtA8N4weq0jd8AL0jj+P5vWpCKOKZSi2U4HNdafwmeE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725963711; c=relaxed/simple; bh=HI6MekB+u2iWUs+RNWCpnzjTQvh4DQaZk8O/tFx6uLg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eMiIgWhSfqsj1j3KYt8WYFx4t3DVmEBfAC5M77lccN0y7nTpj0ob0TGQgJi7U3F7kIoGP0CyGFT2/kWfLxiqtX8oExaSm5jRP+62uPE74ORs8NWBURDQzJTJV1Qhww1jYjCOsZZH4vrmViI+zKexn74Xl+m00lnZ+LmbJ5sxXCQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=GDeFEaGV; 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="GDeFEaGV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5024CC4CEC6; Tue, 10 Sep 2024 10:21:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1725963711; bh=HI6MekB+u2iWUs+RNWCpnzjTQvh4DQaZk8O/tFx6uLg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GDeFEaGVBkmTwQKHKyqRqx/Bot+1GdMoWjx7wz0eb43lLl9lJP/3sYct4LwZtJbwn AtNja9ZbGJuedXYf06olIEuiDT0FYOazqdZ4mE844TbOsvFF9kYFiOfcLgZz3fJEDx ZCC+2KxqG/8z0f+aRT2i6oZnZx9gDUBUw5W30jak= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Guenter Roeck , Sasha Levin Subject: [PATCH 5.15 143/214] hwmon: (lm95234) Fix underflows seen when writing limit attributes Date: Tue, 10 Sep 2024 11:32:45 +0200 Message-ID: <20240910092604.599647481@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910092558.714365667@linuxfoundation.org> References: <20240910092558.714365667@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Guenter Roeck [ Upstream commit af64e3e1537896337405f880c1e9ac1f8c0c6198 ] DIV_ROUND_CLOSEST() after kstrtol() results in an underflow if a large negative number such as -9223372036854775808 is provided by the user. Fix it by reordering clamp_val() and DIV_ROUND_CLOSEST() operations. Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/hwmon/lm95234.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/hwmon/lm95234.c b/drivers/hwmon/lm95234.c index ac169a994ae0..db2aecdfbd17 100644 --- a/drivers/hwmon/lm95234.c +++ b/drivers/hwmon/lm95234.c @@ -301,7 +301,8 @@ static ssize_t tcrit2_store(struct device *dev, struct device_attribute *attr, if (ret < 0) return ret; - val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127); + val = DIV_ROUND_CLOSEST(clamp_val(val, 0, (index ? 255 : 127) * 1000), + 1000); mutex_lock(&data->update_lock); data->tcrit2[index] = val; @@ -350,7 +351,7 @@ static ssize_t tcrit1_store(struct device *dev, struct device_attribute *attr, if (ret < 0) return ret; - val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255); + val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 255000), 1000); mutex_lock(&data->update_lock); data->tcrit1[index] = val; @@ -391,7 +392,7 @@ static ssize_t tcrit1_hyst_store(struct device *dev, if (ret < 0) return ret; - val = DIV_ROUND_CLOSEST(val, 1000); + val = DIV_ROUND_CLOSEST(clamp_val(val, -255000, 255000), 1000); val = clamp_val((int)data->tcrit1[index] - val, 0, 31); mutex_lock(&data->update_lock); @@ -431,7 +432,7 @@ static ssize_t offset_store(struct device *dev, struct device_attribute *attr, return ret; /* Accuracy is 1/2 degrees C */ - val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127); + val = DIV_ROUND_CLOSEST(clamp_val(val, -64000, 63500), 500); mutex_lock(&data->update_lock); data->toffset[index] = val; -- 2.43.0