From patchwork Wed Jan 31 11:37:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Rui X-Patchwork-Id: 13539340 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (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 0929D6D1D2; Wed, 31 Jan 2024 11:37:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.14 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706701050; cv=none; b=K5XPhY5RrIEolWrGIExgV1U+O5MKd1X8eBPWLBq6Kfz6eD7cLF/2S/V+Y36WD5EBNKsLy/0AEtpa+DfXQKUE2DfIYOeuS1wpqkP4ZrfWJvXNv767A548zXgJ7bC4ji+HxcCkhrjZIBOCvtgKvBCBx8iMyLrIT3ebokVeMZY2uqc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706701050; c=relaxed/simple; bh=GvAqwQ4KOZBh0mXfOdAbuk8oUfo2FkUF0mPuB57A4+4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=HAS3gtaaSCo5bfUJNiw/Mb2ZeY6KrUNaYdxL/vP4EEBXxIK/ByeOAdO40dZ0GScMvfW2EJj2OXiaPgkngrSRDn3hHjx+uxj9UbtaTwPUVBn2Odlp84pVuHItdroRmxTo654iFw2uru6XpD/y58AuzCHAUgszLEu+KCABt4zLxFo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=gHWjYalG; arc=none smtp.client-ip=198.175.65.14 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="gHWjYalG" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1706701048; x=1738237048; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=GvAqwQ4KOZBh0mXfOdAbuk8oUfo2FkUF0mPuB57A4+4=; b=gHWjYalGxYdoeFDEzjBJyiRO2S3fDrmTNbr9PoYEogwCfTR21QUZe23H pQ/Oorsi+Xgaj9TAjZJYwCIN8+CcP51CZlqLoj0vDPLRVf4NZcXq93TL5 y+XrNusNotfgKq2MKdAd9GVCpNvNS/HpDBeddzlsOYqmg6PY05Cl6g08L lnXQPT2fdGUDbqecj/GkU+eIg73TBlLpLWqdTs4Ji2HMRnMzBd+dKgeIq 87RLWT2gh4QEyHcAKiJeIjwNfl7+RCmFS/I1h1Xg7sXEG/8+MUqg4bi2n IXlKffMmwFw8qBDIZU7jh4L/WeKri7nblnsiFZBwiszBbgQcX1z+iYN3h w==; X-IronPort-AV: E=McAfee;i="6600,9927,10969"; a="3441622" X-IronPort-AV: E=Sophos;i="6.05,231,1701158400"; d="scan'208";a="3441622" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Jan 2024 03:37:27 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10969"; a="788542472" X-IronPort-AV: E=Sophos;i="6.05,231,1701158400"; d="scan'208";a="788542472" Received: from puhongt-mobl2.ccr.corp.intel.com (HELO rzhang1-mobl7.ccr.corp.intel.com) ([10.255.29.147]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Jan 2024 03:37:24 -0800 From: Zhang Rui To: rafael.j.wysocki@intel.com Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH 1/6] powercap: intel_rapl: Fix a NULL pointer dereference bug Date: Wed, 31 Jan 2024 19:37:08 +0800 Message-Id: <20240131113713.74779-2-rui.zhang@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240131113713.74779-1-rui.zhang@intel.com> References: <20240131113713.74779-1-rui.zhang@intel.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 A NULL pointer dereference bug is triggered when probing MMIO RAPL driver on platforms with CPU ID not listed in intel_rapl_common CPU model list. This is because the intel_rapl_common module still probes on such platforms even if 'defaults_msr' is not set after commit 1488ac990ac8 ("powercap: intel_rapl: Allow probing without CPUID match"). Thus the MMIO RAPL rp->priv->defaults is NULL when registering to RAPL framework. Fix the problem by adding sanity check to ensure rp->priv->rapl_defaults is always valid. Fixes: 1488ac990ac8 ("powercap: intel_rapl: Allow probing without CPUID match") Signed-off-by: Zhang Rui Cc: --- drivers/powercap/intel_rapl_common.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c index 2feed036c1cd..1a739afd47d9 100644 --- a/drivers/powercap/intel_rapl_common.c +++ b/drivers/powercap/intel_rapl_common.c @@ -759,6 +759,11 @@ static int rapl_config(struct rapl_package *rp) default: return -EINVAL; } + + /* defaults_msr can be NULL on unsupported platforms */ + if (!rp->priv->defaults || !rp->priv->rpi) + return -ENODEV; + return 0; }