From patchwork Tue Mar 8 19:09:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Norris X-Patchwork-Id: 549417 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 4E8CAC433EF for ; Tue, 8 Mar 2022 19:10:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350073AbiCHTL2 (ORCPT ); Tue, 8 Mar 2022 14:11:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349957AbiCHTLH (ORCPT ); Tue, 8 Mar 2022 14:11:07 -0500 Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E4EF56221 for ; Tue, 8 Mar 2022 11:09:51 -0800 (PST) Received: by mail-pj1-x102d.google.com with SMTP id m11-20020a17090a7f8b00b001beef6143a8so190551pjl.4 for ; Tue, 08 Mar 2022 11:09:51 -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=ib6FySm/SIILussMyTK7iihJLMt8Z1en8slTwlrFY5+R7JaTUXQp9kyMH9l8rQzknO em20DU9AF9v5Tq9pS2VCCi+eMzdQAtqCXv5+LQSGxEgZsykZLTjntKZ+bWUTwJj7eMqp yne0N1Zo66kQ5sLI0k1LFhdoc/452HkjAHras= 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=fKOKR3XTH63kRn7FlB3mzJVMVwqPlq6u17436PAtK/ixaT+P1hnI4CWLRL/my+FO7u 0WW4W5WPdM/4iLmt4rxoXMsvcGLAH7332eMmwQhzoeSP7Y/5rmYz9HwgDaIoD8Ekvfkt DDwilK0QdGl0TlBOdXZ5a4mLqN0vnqvmHR8a2aJywHrHLkia+hswfwlsisD/dCO11/rm hufPaOtAMS+5iY1/pQU6Uq5PJ0i7UY403uVeNX8zxhgpEV9zwcxRvVtASYNQ2XSjosj5 QfvZ3qZVz/5fAc8SQYNvhrm49GkTEH5iamF8AhYAc7+DQTxbf/5ow/Z96yHYkGc2V4JH NsBQ== X-Gm-Message-State: AOAM533mkSGrWYKdXDfQ6jxfEd6GiTt0Ki3DWtYu7wNNR7gZdwUewlrS Vwvj8CW9zmZw2wswSBKNfjTft/l9rw7vKQ== X-Google-Smtp-Source: ABdhPJy2AstUgBchjh7EwV+wcmMkcQM+A0fg1kljv5PG4sghXwqZVBUofbggon0HsXXkeiKY53yCJw== X-Received: by 2002:a17:902:b945:b0:14f:f05e:5479 with SMTP id h5-20020a170902b94500b0014ff05e5479mr19169202pls.94.1646766591062; Tue, 08 Mar 2022 11:09:51 -0800 (PST) Received: from localhost ([2620:15c:202:201:b3e3:a188:cbfc:3a0e]) by smtp.gmail.com with UTF8SMTPSA id z13-20020a63e10d000000b003733d6c90e4sm15339293pgh.82.2022.03.08.11.09.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Mar 2022 11:09:50 -0800 (PST) From: Brian Norris To: MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Rob Herring , Heiko Stuebner Cc: Derek Basehore , devicetree@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, Lin Huang , linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, Brian Norris Subject: [PATCH v4 15/15] PM / devfreq: rk3399_dmc: Avoid static (reused) profile Date: Tue, 8 Mar 2022 11:09:01 -0800 Message-Id: <20220308110825.v4.15.I8d71e9555aca1fa7e532d22dd1ef27976f21799d@changeid> X-Mailer: git-send-email 2.35.1.616.g0bdcbb4464-goog In-Reply-To: <20220308190901.3144566-1-briannorris@chromium.org> References: <20220308190901.3144566-1-briannorris@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@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)) {