From patchwork Wed May 29 13:34:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 800244 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (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 C38F617BAF; Wed, 29 May 2024 13:41:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716990062; cv=none; b=oTOqrdivD/vtxkLsQDpCK90jRl19OfvQqPf5hnaEbJouMP3TQ6+ccly+LNcxcqjJxmckKsHpXQAFSt1s0Vw48YVVjBm+7n17X/Tlb+06mY+6JC99TlihlPS9FNcWyHz7oUNOWMhTCiFaRMMRFkunZfHrz7ukRj7k3yJdbF23rMI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716990062; c=relaxed/simple; bh=HRhhejitLik28OgzlcVBvJkb8ZtOvIVvfPv96DprgD8=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=byAze06mzPoeX46ov2Ktjssjmw5AoFv0W+VXj4Q6XOTDOBTIC+Vyr76GmwKTZ99w80uNBj3SBEUYLyHi+dcqNSxpCPsiJaL3ncMFcS5byLcBi0KtgoVI9OQ1T/k7irGP7l7phxir5XSzdC+DC2kOmj8LpluxqKWmkUpDPRRLkQk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Vq9Qh6LRGz6J6m1; Wed, 29 May 2024 21:36:44 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id 0F0C5140DDB; Wed, 29 May 2024 21:40:59 +0800 (CST) Received: from SecurePC-101-06.china.huawei.com (10.122.247.231) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Wed, 29 May 2024 14:40:58 +0100 From: Jonathan Cameron To: Marc Zyngier , Will Deacon , Catalin Marinas , , , , , CC: Mark Rutland , Thomas Gleixner , Peter Zijlstra , , , Russell King , "Rafael J . Wysocki" , Miguel Luis , James Morse , Salil Mehta , Jean-Philippe Brucker , Hanjun Guo , Gavin Shan , Ingo Molnar , Borislav Petkov , Dave Hansen , , , Subject: [PATCH v10 12/19] arm64: acpi: Harden get_cpu_for_acpi_id() against missing CPU entry Date: Wed, 29 May 2024 14:34:39 +0100 Message-ID: <20240529133446.28446-13-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240529133446.28446-1-Jonathan.Cameron@huawei.com> References: <20240529133446.28446-1-Jonathan.Cameron@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml100001.china.huawei.com (7.191.160.183) To lhrpeml500005.china.huawei.com (7.191.163.240) In a review discussion of the changes to support vCPU hotplug where a check was added on the GICC being enabled if was online, it was noted that there is need to map back to the cpu and use that to index into a cpumask. As such, a valid ID is needed. If an MPIDR check fails in acpi_map_gic_cpu_interface() it is possible for the entry in cpu_madt_gicc[cpu] == NULL. This function would then cause a NULL pointer dereference. Whilst a path to trigger this has not been established, harden this caller against the possibility. Reviewed-by: Gavin Shan Signed-off-by: Jonathan Cameron --- V10: Fix description above (duplicated word). Picked up Gavin's tag. --- arch/arm64/include/asm/acpi.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h index bc9a6656fc0c..a407f9cd549e 100644 --- a/arch/arm64/include/asm/acpi.h +++ b/arch/arm64/include/asm/acpi.h @@ -124,7 +124,8 @@ static inline int get_cpu_for_acpi_id(u32 uid) int cpu; for (cpu = 0; cpu < nr_cpu_ids; cpu++) - if (uid == get_acpi_id_for_cpu(cpu)) + if (acpi_cpu_get_madt_gicc(cpu) && + uid == get_acpi_id_for_cpu(cpu)) return cpu; return -EINVAL;