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=-9.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,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 38340C32789 for ; Sun, 4 Nov 2018 14:00:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F2E3B204FD for ; Sun, 4 Nov 2018 14:00:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="vUp1bST3" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F2E3B204FD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.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 S1731868AbeKDXPx (ORCPT ); Sun, 4 Nov 2018 18:15:53 -0500 Received: from mail.kernel.org ([198.145.29.99]:47548 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731201AbeKDXIi (ORCPT ); Sun, 4 Nov 2018 18:08:38 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 661C72086C; Sun, 4 Nov 2018 13:53:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541339615; bh=AFIg6yxLQbQgSaaVf87pcDanS5zbx0vvaPySuBvwugk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vUp1bST30Ow+RJ+gZJvIwPNtUztHJQN/6lwqXVFKmF21Oocb3ogve3mZALAxpF8Ov O+AIVbIfae4CMczMg+49oGEI+uJx32vryihO+RCKr66TbWj1ilH0RuBsOGPHqlFj7i hskMMFcHH1+Iu66klbDQ2SlEsgDzM1muSaVQegr8= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Sam Bobroff , Michael Ellerman , Sasha Levin Subject: [PATCH AUTOSEL 4.14 08/30] powerpc/eeh: Fix possible null deref in eeh_dump_dev_log() Date: Sun, 4 Nov 2018 08:53:03 -0500 Message-Id: <20181104135325.88524-8-sashal@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181104135325.88524-1-sashal@kernel.org> References: <20181104135325.88524-1-sashal@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- arch/powerpc/kernel/eeh.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c index 116000b45531..45322b37669a 100644 --- a/arch/powerpc/kernel/eeh.c +++ b/arch/powerpc/kernel/eeh.c @@ -169,6 +169,11 @@ static size_t eeh_dump_dev_log(struct eeh_dev *edev, char *buf, size_t len) 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)); -- 2.17.1