From patchwork Mon Nov 5 21:38:36 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liam Merwick X-Patchwork-Id: 10669255 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5E5091709 for ; Mon, 5 Nov 2018 21:42:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 58A1A29EC5 for ; Mon, 5 Nov 2018 21:42:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4CB4229E75; Mon, 5 Nov 2018 21:42:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C764F29E73 for ; Mon, 5 Nov 2018 21:42:27 +0000 (UTC) Received: from localhost ([::1]:37710 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gJmde-0001Vt-NN for patchwork-qemu-devel@patchwork.kernel.org; Mon, 05 Nov 2018 16:42:26 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36222) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gJmaP-0007IB-M5 for qemu-devel@nongnu.org; Mon, 05 Nov 2018 16:39:06 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gJmaK-0003FZ-W5 for qemu-devel@nongnu.org; Mon, 05 Nov 2018 16:39:04 -0500 Received: from aserp2120.oracle.com ([141.146.126.78]:33208) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gJma2-0002fQ-9W; Mon, 05 Nov 2018 16:38:46 -0500 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id wA5LT6lh151034; Mon, 5 Nov 2018 21:38:33 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2018-07-02; bh=GBfEG6hiPGfZgKKXOuIRw2Qvjg/3+UvEwe9egiv3Umo=; b=doa+R/vuzJ8EP/KksNLWmWsGfI1yvIaxjLAIeASe0ZWxyOC/n64WLBm7lL/ksfkr68vc WrrKsyv5AEzUav8wNveus5mNZEOeh7ERdI/oX+5PyeWrc5sJ6HvNd4p8TjQ5R5d2yS+u ZvvTNJzbf+hIT1Iw0Ds38Bg2Q+EhaBU2pC0ayd4i9anWAknfFCTZ0BH77LmMfhuThpvk ZdmdPYTLInK6L3nhccAu1XsyU0wv9EP7Ufx0yCISRn135sChDMZrqR31XPolRvznOMRm PFCJvQOt0glpa24gYIk8HK5OrPJ4xZz2n8v1t+c8anT3AbuwNNx/z6ECEAsxIdDN4Fne 3A== Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by aserp2120.oracle.com with ESMTP id 2nh3mphpyb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 05 Nov 2018 21:38:33 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id wA5LcQAs024631 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 5 Nov 2018 21:38:27 GMT Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id wA5LcQlI023741; Mon, 5 Nov 2018 21:38:26 GMT Received: from ol7.uk.oracle.com (/10.175.201.67) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 05 Nov 2018 13:38:26 -0800 From: Liam Merwick To: qemu-devel@nongnu.org Date: Mon, 5 Nov 2018 21:38:36 +0000 Message-Id: <1541453919-25973-3-git-send-email-Liam.Merwick@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1541453919-25973-1-git-send-email-Liam.Merwick@oracle.com> References: <1541453919-25973-1-git-send-email-Liam.Merwick@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9068 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=974 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1811050190 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 141.146.126.78 Subject: [Qemu-devel] [PATCH v5 2/5] block: Null pointer dereference in blk_root_get_parent_desc() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, jsnow@redhat.com, qemu-block@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP The dev_id returned by the call to blk_get_attached_dev_id() in blk_root_get_parent_desc() can be NULL (an internal call to object_get_canonical_path may have returned NULL). Instead of just checking this case before before dereferencing, adjust blk_get_attached_dev_id() to return the empty string if no object path can be found (similar to the case when blk->dev is NULL and an empty string is returned). Signed-off-by: Liam Merwick Reviewed-by: Max Reitz --- block/block-backend.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/block-backend.c b/block/block-backend.c index dc0cd5772413..a2061a565024 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -918,7 +918,8 @@ char *blk_get_attached_dev_id(BlockBackend *blk) } else if (dev->id) { return g_strdup(dev->id); } - return object_get_canonical_path(OBJECT(dev)); + + return object_get_canonical_path(OBJECT(dev)) ?: g_strdup(""); } /*