From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E038BC04A6B for ; Mon, 6 May 2019 14:41:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B65BF21019 for ; Mon, 6 May 2019 14:41:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557153679; bh=sx1pPAWwYCqiei8ugsKwF71A33BMH82+O9H5YI+MoGE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FFolG5dMmVsaJlpfihwhG2a4Tc+pPQDCGuvtHpRVgbq6h+dqmMRzkVbzXymI5/GYf +XZs7vKeCsNK7L8UV6bOZwRP1OWDCFaoPwgVT9553ceKMjp9nfTl7CO+WdPHPhkddD 0eSMcmmDYxCCh3MvWfzRnSqHNGGHwn+HvgP7oU2E= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727699AbfEFOlS (ORCPT ); Mon, 6 May 2019 10:41:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:35236 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728208AbfEFOlS (ORCPT ); Mon, 6 May 2019 10:41:18 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4155A2087F; Mon, 6 May 2019 14:41:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557153677; bh=sx1pPAWwYCqiei8ugsKwF71A33BMH82+O9H5YI+MoGE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oSqeyZzfwWYEXtLh+BIjVr44VTfk3uMw3YbCrbI8IJdoT2lkgOCRzT6n8z83s6au4 lv74ZoxpAUn9KsO32CBu/xGjLIQ/5qD8cZ28VAFliSgCbEZrAeBldyAreIt0viDwi8 ZOcA4KV8cnBF5ER+sEMbIdSwhqeesGC8JNN2sw+M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Julien Thierry , Wei Li , Catalin Marinas , Sasha Levin Subject: [PATCH 4.19 54/99] arm64: fix wrong check of on_sdei_stack in nmi context Date: Mon, 6 May 2019 16:32:27 +0200 Message-Id: <20190506143058.974732530@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190506143053.899356316@linuxfoundation.org> References: <20190506143053.899356316@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 1c41860864c8ae0387ef7d44f0000e99cbb2e06d ] When doing unwind_frame() in the context of pseudo nmi (need enable CONFIG_ARM64_PSEUDO_NMI), reaching the bottom of the stack (fp == 0, pc != 0), function on_sdei_stack() will return true while the sdei acpi table is not inited in fact. This will cause a "NULL pointer dereference" oops when going on. Reviewed-by: Julien Thierry Signed-off-by: Wei Li Signed-off-by: Catalin Marinas Signed-off-by: Sasha Levin --- arch/arm64/kernel/sdei.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/kernel/sdei.c b/arch/arm64/kernel/sdei.c index 5ba4465e44f0..ea94cf8f9dc6 100644 --- a/arch/arm64/kernel/sdei.c +++ b/arch/arm64/kernel/sdei.c @@ -94,6 +94,9 @@ static bool on_sdei_normal_stack(unsigned long sp, struct stack_info *info) unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr); unsigned long high = low + SDEI_STACK_SIZE; + if (!low) + return false; + if (sp < low || sp >= high) return false; @@ -111,6 +114,9 @@ static bool on_sdei_critical_stack(unsigned long sp, struct stack_info *info) unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_critical_ptr); unsigned long high = low + SDEI_STACK_SIZE; + if (!low) + return false; + if (sp < low || sp >= high) return false; -- 2.20.1