From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1352246420; Mon, 1 Apr 2024 15:50:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711986618; cv=none; b=Mj8q2RulQjkG7xevYmLXMg1fEGFZhCrDdTNK70+hw3bZ6KZPOM73WVVKkrXyKlzJZYpdpXTV/ku8WwwEemy58RjGVN4kekTPs2p8sqRf6AI3JeFUvS5JIY4YNwF6JOpJEAvGD/LvYji/RQ5rXGsSf03+FjFST/YJqv9WOcI7/Wc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711986618; c=relaxed/simple; bh=iezbkCOLBDNPUnnvXN4dcCe8D60gSu8vtuJmaxI1F3E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QRP4943z0/dd6Q12visJN8MPPDBLSqitlL7yUDpYiMBUT7eSUaC6wNs2eFgqrdE+OF+O2UfUzmNw+Kl5t+ICMm/OuN17ZZeKQEE2QILLOLugKb9PbtXh3tV7++Sfgvwce5moND5/IzITD+Q00t+q7TReAY5bzy0m0yPUsd15p4E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=THNRD+Xa; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="THNRD+Xa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8E2E7C433F1; Mon, 1 Apr 2024 15:50:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1711986618; bh=iezbkCOLBDNPUnnvXN4dcCe8D60gSu8vtuJmaxI1F3E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=THNRD+Xa0DnvRWWIK1TQq8Ui+Ch0uxaJqufSJYOnDx0A1fUoJfBC/TzD+sx3E6mUs gy4ItHbgMP5VDSokFQDG6muUUbGYOoWjJTZCZknOfp4MrOo0SY7OiNVRgs32ooBeZV tVjce+W8BwtHuw+AiItKIHtxXNmLi8GUpxKkHCjc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhang Rui , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 6.8 030/399] powercap: intel_rapl: Fix a NULL pointer dereference Date: Mon, 1 Apr 2024 17:39:56 +0200 Message-ID: <20240401152550.063272304@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240401152549.131030308@linuxfoundation.org> References: <20240401152549.131030308@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhang Rui [ Upstream commit 2d1f5006ff95770da502f8cee2a224a1ff83866e ] A NULL pointer dereference is triggered when probing the 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: 6.5+ # 6.5+ Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- 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 2feed036c1cd4..1a739afd47d96 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; } -- 2.43.0