From patchwork Tue Mar 8 00:09:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Norris X-Patchwork-Id: 12772798 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2958DC433EF for ; Tue, 8 Mar 2022 00:10:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344077AbiCHALn (ORCPT ); Mon, 7 Mar 2022 19:11:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52922 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344106AbiCHALk (ORCPT ); Mon, 7 Mar 2022 19:11:40 -0500 Received: from mail-pj1-x1029.google.com (mail-pj1-x1029.google.com [IPv6:2607:f8b0:4864:20::1029]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A54B737A22 for ; Mon, 7 Mar 2022 16:10:39 -0800 (PST) Received: by mail-pj1-x1029.google.com with SMTP id m22so15618970pja.0 for ; Mon, 07 Mar 2022 16:10:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ExeMvBUYf18gUbw3oNoBhQIqfKznu+dtCvkD2ZUwMDI=; b=dUSKXKD2oLryc1nruR3FNcnsYYhThzA308IDtnm37tWHi+DdqgeCtz4xqfUo6Nt7UW fI4qPKxksSC65tT0l7YkCINT05BtyR+OAL8TSWjGo/RlhyavUD+bacUAkumZNAfYZZ52 goJj0JVvFwvvujDp0z90ZPeHro8+w88DMROGA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ExeMvBUYf18gUbw3oNoBhQIqfKznu+dtCvkD2ZUwMDI=; b=X2SqA7L/7027RnRoWpfVQtai4iaGYcf/+uHjD9U3sH0K+V3+GvVUEUNTTnx/QIg0nd 2IVtfTBdGCpoOWH0n/Ovlki13fGzzOat69phmiU+EtD6pLW3hOHwSn3RPDVSjaPUGZ2A cPuKw6/nz5fWQUSfB+n4DnT0Sv2mGdJahNVprtF+hRMNml2PZjwbhu2rMGinca8tCJtA sIdg6dOqmMTsaNRZvVhe60sj5EZIS6kxpO1VYKrfou6gq5T41OSHiwRRMZ7YdPOQ0+pS HRRLni3Mqy/RixB+fykTA9YRB4fbfBh9IPE/Hu31ibrVoAKq5UGANPRpkKxkT1q4lZHN sGgQ== X-Gm-Message-State: AOAM531OjqLsmO1VnWpkdTGicElI24ZlowK/1NvTu5gFMOAWIJrv8aCY xaau459MopiX4zNDJrF3T44v2w== X-Google-Smtp-Source: ABdhPJyrcw+XhrxMuU5ct7+AqtGPHqcx+ajYHdkXRnnV0rz1xXVGUvlzhLNfmp1oAPTEeWB/2Df2Ag== X-Received: by 2002:a17:902:ed82:b0:151:d081:3832 with SMTP id e2-20020a170902ed8200b00151d0813832mr14035788plj.165.1646698239237; Mon, 07 Mar 2022 16:10:39 -0800 (PST) Received: from localhost ([2620:15c:202:201:e551:44dc:2842:57f1]) by smtp.gmail.com with UTF8SMTPSA id p25-20020a637419000000b0037fa57520adsm8884252pgc.27.2022.03.07.16.10.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 07 Mar 2022 16:10:38 -0800 (PST) From: Brian Norris To: MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Rob Herring Cc: Lin Huang , Heiko Stuebner , Derek Basehore , linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Brian Norris Subject: [PATCH v3 15/15] PM / devfreq: rk3399_dmc: Avoid static (reused) profile Date: Mon, 7 Mar 2022 16:09:45 -0800 Message-Id: <20220307160918.v3.15.I8d71e9555aca1fa7e532d22dd1ef27976f21799d@changeid> X-Mailer: git-send-email 2.35.1.616.g0bdcbb4464-goog In-Reply-To: <20220308000945.706701-1-briannorris@chromium.org> References: <20220308000945.706701-1-briannorris@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org This static struct can get reused if the device gets removed/reprobed, and that causes use-after-free in its ->freq_table. Let's just move the struct to our dynamic allocation. Signed-off-by: Brian Norris --- (no changes since v2) Changes in v2: * New patch drivers/devfreq/rk3399_dmc.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c index 9615658d04ae..e494d1497d60 100644 --- a/drivers/devfreq/rk3399_dmc.c +++ b/drivers/devfreq/rk3399_dmc.c @@ -38,6 +38,7 @@ struct rk3399_dmcfreq { struct device *dev; struct devfreq *devfreq; + struct devfreq_dev_profile profile; struct devfreq_simple_ondemand_data ondemand_data; struct clk *dmc_clk; struct devfreq_event_dev *edev; @@ -228,13 +229,6 @@ static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq) return 0; } -static struct devfreq_dev_profile rk3399_devfreq_dmc_profile = { - .polling_ms = 200, - .target = rk3399_dmcfreq_target, - .get_dev_status = rk3399_dmcfreq_get_dev_status, - .get_cur_freq = rk3399_dmcfreq_get_cur_freq, -}; - static __maybe_unused int rk3399_dmcfreq_suspend(struct device *dev) { struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev); @@ -422,10 +416,16 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev) data->volt = dev_pm_opp_get_voltage(opp); dev_pm_opp_put(opp); - rk3399_devfreq_dmc_profile.initial_freq = data->rate; + data->profile = (struct devfreq_dev_profile) { + .polling_ms = 200, + .target = rk3399_dmcfreq_target, + .get_dev_status = rk3399_dmcfreq_get_dev_status, + .get_cur_freq = rk3399_dmcfreq_get_cur_freq, + .initial_freq = data->rate, + }; data->devfreq = devm_devfreq_add_device(dev, - &rk3399_devfreq_dmc_profile, + &data->profile, DEVFREQ_GOV_SIMPLE_ONDEMAND, &data->ondemand_data); if (IS_ERR(data->devfreq)) {