From patchwork Mon Nov 18 01:50:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pan Nengyuan X-Patchwork-Id: 11248779 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A546E913 for ; Mon, 18 Nov 2019 01:56:17 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7DA2520679 for ; Mon, 18 Nov 2019 01:56:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7DA2520679 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:57514 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iWWH2-0005ci-Lf for patchwork-qemu-devel@patchwork.kernel.org; Sun, 17 Nov 2019 20:56:16 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:34860) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iWWBo-0003ZN-Fe for qemu-devel@nongnu.org; Sun, 17 Nov 2019 20:50:55 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iWWBn-0006vG-CD for qemu-devel@nongnu.org; Sun, 17 Nov 2019 20:50:52 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:44354 helo=huawei.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iWWBk-0006uK-KU; Sun, 17 Nov 2019 20:50:48 -0500 Received: from DGGEMS414-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 094F0E37F54E9B4B59E8; Mon, 18 Nov 2019 09:50:44 +0800 (CST) Received: from HGHY2P002143101.china.huawei.com (10.184.39.213) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server id 14.3.439.0; Mon, 18 Nov 2019 09:50:36 +0800 From: To: Subject: [Qemu-devel][PATCH] ppc/spapr_events: fix potential NULL pointer dereference in rtas_event_log_dequeue Date: Mon, 18 Nov 2019 09:50:13 +0800 Message-ID: <1574041813-35408-1-git-send-email-pannengyuan@huawei.com> X-Mailer: git-send-email 2.7.2.windows.1 MIME-Version: 1.0 X-Originating-IP: [10.184.39.213] X-CFilter-Loop: Reflected X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 45.249.212.35 X-Mailman-Approved-At: Sun, 17 Nov 2019 20:55:24 -0500 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: zhang.zhanghailiang@huawei.com, PanNengyuan , kenny.zhangjun@huawei.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, kuhn.chenqun@huawei.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: PanNengyuan source is being dereferenced before it is null checked, hence there is a potential null pointer dereference. This fixes: 360 CID 68911917: (NULL_RETURNS) 361. dereference: Dereferencing "source", which is known to be "NULL". 361 if (source->mask & event_mask) { 362 break; 363 } Reported-by: Euler Robot Signed-off-by: PanNengyuan --- hw/ppc/spapr_events.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c index 0e4c195..febd2ef 100644 --- a/hw/ppc/spapr_events.c +++ b/hw/ppc/spapr_events.c @@ -358,7 +358,7 @@ static SpaprEventLogEntry *rtas_event_log_dequeue(SpaprMachineState *spapr, rtas_event_log_to_source(spapr, spapr_event_log_entry_type(entry)); - if (source->mask & event_mask) { + if (source && (source->mask & event_mask)) { break; } }