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=-7.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,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 A4AEAC43441 for ; Mon, 19 Nov 2018 16:31:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6F42D2086A for ; Mon, 19 Nov 2018 16:31:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="FSciNmN7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6F42D2086A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730354AbeKTCzU (ORCPT ); Mon, 19 Nov 2018 21:55:20 -0500 Received: from mail.kernel.org ([198.145.29.99]:52920 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730034AbeKTCzT (ORCPT ); Mon, 19 Nov 2018 21:55:19 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 5CAA12089F; Mon, 19 Nov 2018 16:31:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1542645072; bh=CkRNP8bNz7jFiambCZc5s9CHrh7aHJ6Ixts13NDU6Ww=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FSciNmN7vxnyWkOSopLbz2kAV2yr54Jr6FvWUnArkMZ2RYzzWJmw54ivBMKzAs7AV ldQo83wBgItPcaurlQK/nY3897iOTQc+fJngFD1TONQtMIFp22fpX8/CbRBV+wyGpT MSfmzMGFl7fvoamyxTEWG6fblsxYJm27cjA5g6Ps= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sam Bobroff , Michael Ellerman , Sasha Levin Subject: [PATCH 4.19 008/205] powerpc/eeh: Fix possible null deref in eeh_dump_dev_log() Date: Mon, 19 Nov 2018 17:25:15 +0100 Message-Id: <20181119162618.550753301@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181119162616.586062722@linuxfoundation.org> References: <20181119162616.586062722@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sam Bobroff [ Upstream commit f9bc28aedfb5bbd572d2d365f3095c1becd7209b ] If an error occurs during an unplug operation, it's possible for eeh_dump_dev_log() to be called when edev->pdn is null, which currently leads to dereferencing a null pointer. Handle this by skipping the error log for those devices. Signed-off-by: Sam Bobroff Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/kernel/eeh.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/arch/powerpc/kernel/eeh.c +++ b/arch/powerpc/kernel/eeh.c @@ -169,6 +169,11 @@ static size_t eeh_dump_dev_log(struct ee int n = 0, l = 0; char buffer[128]; + if (!pdn) { + pr_warn("EEH: Note: No error log for absent device.\n"); + return 0; + } + n += scnprintf(buf+n, len-n, "%04x:%02x:%02x.%01x\n", pdn->phb->global_number, pdn->busno, PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn));