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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 1B5AAC43467 for ; Fri, 18 Sep 2020 02:26:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D693623600 for ; Fri, 18 Sep 2020 02:26:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600395992; bh=pZdPBhjCbkeixyqGuvLsmWtPpZc48xi+WJ8qgdxG2Xc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pbgNOGZifeukiVQVbhCdDbtBxyZPZYr/STsPu9/15eikjav7h++DVEQS93Pew9Bed aMr2FC1v5idc9suVZHXP6pw2P4bmrfUcSjHq6PJIxybJdNg2GmOpLThILcu6RBCr+k w0aAoFsvm62mGEgIZsrdkPiYVjLyxL9M1yUD+MAs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729330AbgIRC0W (ORCPT ); Thu, 17 Sep 2020 22:26:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:45036 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729325AbgIRCQD (ORCPT ); Thu, 17 Sep 2020 22:16:03 -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 C047023718; Fri, 18 Sep 2020 02:16:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600395362; bh=pZdPBhjCbkeixyqGuvLsmWtPpZc48xi+WJ8qgdxG2Xc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=W4fadeB5a9bjVNEpBUjUx3W5xbGBClJVuSHvfclxaxIQcDtTpdTVAFY9y0r9UWUO6 dArpDM4jOUegSgg5uhSgmlqVeciUQywQCGx3L0kt2ZQ4UyHaK5L0OoktEirQO4gjht q05B1sPZ5f8dNlkOkHAtiPlkMpTk/ryJP1pZqjJM= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Pratik Rajesh Sampat , Daniel Axtens , Michael Ellerman , Sasha Levin , linux-pm@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 56/90] cpufreq: powernv: Fix frame-size-overflow in powernv_cpufreq_work_fn Date: Thu, 17 Sep 2020 22:14:21 -0400 Message-Id: <20200918021455.2067301-56-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918021455.2067301-1-sashal@kernel.org> References: <20200918021455.2067301-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Pratik Rajesh Sampat [ Upstream commit d95fe371ecd28901f11256c610b988ed44e36ee2 ] The patch avoids allocating cpufreq_policy on stack hence fixing frame size overflow in 'powernv_cpufreq_work_fn' Fixes: 227942809b52 ("cpufreq: powernv: Restore cpu frequency to policy->cur on unthrottling") Signed-off-by: Pratik Rajesh Sampat Reviewed-by: Daniel Axtens Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200316135743.57735-1-psampat@linux.ibm.com Signed-off-by: Sasha Levin --- drivers/cpufreq/powernv-cpufreq.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c index b4fc65512aad3..c3b05676e0dbe 100644 --- a/drivers/cpufreq/powernv-cpufreq.c +++ b/drivers/cpufreq/powernv-cpufreq.c @@ -802,6 +802,7 @@ static struct notifier_block powernv_cpufreq_reboot_nb = { void powernv_cpufreq_work_fn(struct work_struct *work) { struct chip *chip = container_of(work, struct chip, throttle); + struct cpufreq_policy *policy; unsigned int cpu; cpumask_t mask; @@ -816,12 +817,14 @@ void powernv_cpufreq_work_fn(struct work_struct *work) chip->restore = false; for_each_cpu(cpu, &mask) { int index; - struct cpufreq_policy policy; - cpufreq_get_policy(&policy, cpu); - index = cpufreq_table_find_index_c(&policy, policy.cur); - powernv_cpufreq_target_index(&policy, index); - cpumask_andnot(&mask, &mask, policy.cpus); + policy = cpufreq_cpu_get(cpu); + if (!policy) + continue; + index = cpufreq_table_find_index_c(policy, policy->cur); + powernv_cpufreq_target_index(policy, index); + cpumask_andnot(&mask, &mask, policy->cpus); + cpufreq_cpu_put(policy); } out: put_online_cpus(); -- 2.25.1