From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 6A2E63CAA41; Wed, 30 Sep 2026 19:13:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790795607; cv=none; b=pybyk/7sk+BPiQ6wZbfHXMJuPC2RFx3ebR67airh4UJ7nhRqulujZkgJil2Y339bSaQkFzaWD8ESendt0G3PD6HH3fvNHiHtlQhc4YCAroDlDQFnWtyVomGmUndt8nbF//iSh+ZIbqv9oV13IzSlodoMhVNQFghFDpj/p5/UFLc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790795607; c=relaxed/simple; bh=dqqwefU+oHZTZ+SYImGqBCMMcf7THJDijj/mry7p7sc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uwrEQD7OX3IT97qz9LOA/pgoRy3rpCt/JYY7I98ZmdowSPgUhTqAMxbvKwVIkr0SdrbJAbzeyE8Ez/f+X9hXIzH3miR5ndXq1WXLH5qn4Dqc/AVwUdt0dyGyE2NhEDPPLQ5xHdqg0IY46DAZyFWHfahXQBLfgT/KCGMx9+T5OpM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=vQO1V21i; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="vQO1V21i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C429B1F00898; Wed, 30 Sep 2026 19:13:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790795606; bh=Ie1he4VaKa1gXuR3P0QwMlGp368zqGSsPn+QUiGlabA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=vQO1V21ij5maIFjbSSn16lCQ5M6tr1k2w4oBpkcVcj2aq8OZCZ0MryjF8OrS3omCo yBp13JV+/oyfjQV3qkL4e2TW6GPYF548pn5c0MdbZ43EdoSGvAioN0m9GOAYMvaCFV sXTEbNtJLGHA7sGid6jTGAQiNldlOJKNbXuuDzoM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhongqiu Han , Runyu Xiao , Viresh Kumar , "Rafael J. Wysocki" Subject: [PATCH 6.6 0621/1193] cpufreq: initialize policy rwsem before sysfs publication Date: Wed, 30 Sep 2026 17:21:45 +0200 Message-ID: <20260930152448.040372088@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152434.301151190@linuxfoundation.org> References: <20260930152434.301151190@linuxfoundation.org> User-Agent: quilt/0.69 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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Runyu Xiao commit 3e5d1bf4bd687beb2cb4e32a07af695455925588 upstream. cpufreq_policy_alloc() initializes policy->rwsem after kobject_init_and_add() has created the policy sysfs directory and its default attributes. A sysfs access can therefore reach a policy callback before the semaphore has been initialized. Initialize policy->rwsem before publishing the policy kobject so sysfs callbacks always see an initialized semaphore. Fixes: 2fc3384dc75b ("cpufreq: Initialize policy->kobj while allocating policy") Cc: All Applicable Link: https://lore.kernel.org/all/20260830155301.2713780-1-runyu.xiao@seu.edu.cn/ Reviewed-by: Zhongqiu Han Signed-off-by: Runyu Xiao Acked-by: Viresh Kumar Link: https://patch.msgid.link/20260902041915.3453421-1-runyu.xiao@seu.edu.cn Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- drivers/cpufreq/cpufreq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1273,6 +1273,8 @@ static struct cpufreq_policy *cpufreq_po if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL)) goto err_free_rcpumask; + init_rwsem(&policy->rwsem); + init_completion(&policy->kobj_unregister); ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, cpufreq_global_kobject, "policy%u", cpu); @@ -1287,8 +1289,6 @@ static struct cpufreq_policy *cpufreq_po goto err_free_real_cpus; } - init_rwsem(&policy->rwsem); - freq_constraints_init(&policy->constraints); policy->nb_min.notifier_call = cpufreq_notifier_min;