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,URIBL_BLOCKED,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 A1D35C433FF for ; Fri, 2 Aug 2019 13:26:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 75D1A21841 for ; Fri, 2 Aug 2019 13:26:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564752374; bh=4oWQDHZFwKM0CyiLtzfXQIeFDTAs45D2SNwezf9ahlY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=uiwKhIlq08LXy/iIQ4xz/dwAl2gynRpgp5Z9n/V4MARjBgjbLRf4yI6kxj3NWYTkt dpsrERq8ul45wPBEEcxbxiuM6w5kDuMJ5ugUk+NUYwI4zsqgHnpq8nsEH5x2gDYwXm ZobaTvqnXWtUSDBurCu53eUSPhMZoT9VI3avLwaE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2394510AbfHBN0M (ORCPT ); Fri, 2 Aug 2019 09:26:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:36818 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2394459AbfHBN0H (ORCPT ); Fri, 2 Aug 2019 09:26:07 -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 500F121850; Fri, 2 Aug 2019 13:26:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564752367; bh=4oWQDHZFwKM0CyiLtzfXQIeFDTAs45D2SNwezf9ahlY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MJVnc7WQhM9j3Q5cqTr7jvwW4WdmdFtNRWXlrUv7ZqsBPGMvENpkrwNDuz+gkiYUN xGkiCqkM0dr8q6p7vOAhH6kcKrXSawbwxJDFheF7mzBhu2N/K1Aj8BbwMea8GlcKpx S0Ee7jA7LJfIyqyuLVOZWVGNH5GSZG8jKtp8TV9k= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Wen Yang , Viresh Kumar , "Rafael J . Wysocki" , Sasha Levin , linuxppc-dev@lists.ozlabs.org, linux-pm@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 08/22] cpufreq/pasemi: fix use-after-free in pas_cpufreq_cpu_init() Date: Fri, 2 Aug 2019 09:25:32 -0400 Message-Id: <20190802132547.14517-8-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190802132547.14517-1-sashal@kernel.org> References: <20190802132547.14517-1-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: Wen Yang [ Upstream commit e0a12445d1cb186d875410d093a00d215bec6a89 ] The cpu variable is still being used in the of_get_property() call after the of_node_put() call, which may result in use-after-free. Fixes: a9acc26b75f6 ("cpufreq/pasemi: fix possible object reference leak") Signed-off-by: Wen Yang Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/cpufreq/pasemi-cpufreq.c | 23 +++++++++-------------- 1 file changed, 9 insertions(+), 14 deletions(-) diff --git a/drivers/cpufreq/pasemi-cpufreq.c b/drivers/cpufreq/pasemi-cpufreq.c index 58c933f483004..991b6a3062c4f 100644 --- a/drivers/cpufreq/pasemi-cpufreq.c +++ b/drivers/cpufreq/pasemi-cpufreq.c @@ -145,10 +145,18 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy) int err = -ENODEV; cpu = of_get_cpu_node(policy->cpu, NULL); + if (!cpu) + goto out; + max_freqp = of_get_property(cpu, "clock-frequency", NULL); of_node_put(cpu); - if (!cpu) + if (!max_freqp) { + err = -EINVAL; goto out; + } + + /* we need the freq in kHz */ + max_freq = *max_freqp / 1000; dn = of_find_compatible_node(NULL, NULL, "1682m-sdc"); if (!dn) @@ -185,16 +193,6 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy) } pr_debug("init cpufreq on CPU %d\n", policy->cpu); - - max_freqp = of_get_property(cpu, "clock-frequency", NULL); - if (!max_freqp) { - err = -EINVAL; - goto out_unmap_sdcpwr; - } - - /* we need the freq in kHz */ - max_freq = *max_freqp / 1000; - pr_debug("max clock-frequency is at %u kHz\n", max_freq); pr_debug("initializing frequency table\n"); @@ -212,9 +210,6 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy) return cpufreq_generic_init(policy, pas_freqs, get_gizmo_latency()); -out_unmap_sdcpwr: - iounmap(sdcpwr_mapbase); - out_unmap_sdcasr: iounmap(sdcasr_mapbase); out: -- 2.20.1