From owner-svn-src-stable@freebsd.org Mon Jun 13 05:13:53 2016 Return-Path: Delivered-To: svn-src-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 72531AF1ECA; Mon, 13 Jun 2016 05:13:53 +0000 (UTC) (envelope-from sephe@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 258232E90; Mon, 13 Jun 2016 05:13:53 +0000 (UTC) (envelope-from sephe@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id u5D5DqwR036116; Mon, 13 Jun 2016 05:13:52 GMT (envelope-from sephe@FreeBSD.org) Received: (from sephe@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id u5D5DqD0036115; Mon, 13 Jun 2016 05:13:52 GMT (envelope-from sephe@FreeBSD.org) Message-Id: <201606130513.u5D5DqD0036115@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: sephe set sender to sephe@FreeBSD.org using -f From: Sepherosa Ziehau Date: Mon, 13 Jun 2016 05:13:52 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r301855 - stable/10/sys/dev/hyperv/storvsc X-SVN-Group: stable-10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 13 Jun 2016 05:13:53 -0000 Author: sephe Date: Mon Jun 13 05:13:52 2016 New Revision: 301855 URL: https://svnweb.freebsd.org/changeset/base/301855 Log: MFC 295295 hyperv/stor: Fix the NULL pointer dereference Reported by: Netapp Submitted by: Hongjiang Zhang Reviewed by: adrian, sephe, Dexuan Cui Approved by: adrian (mentor) MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5097 Modified: stable/10/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c ============================================================================== --- stable/10/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c Mon Jun 13 05:06:07 2016 (r301854) +++ stable/10/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c Mon Jun 13 05:13:52 2016 (r301855) @@ -1561,13 +1561,12 @@ static void storvsc_destroy_bounce_buffer(struct sglist *sgl) { struct hv_sgl_node *sgl_node = NULL; - - sgl_node = LIST_FIRST(&g_hv_sgl_page_pool.in_use_sgl_list); - LIST_REMOVE(sgl_node, link); - if (NULL == sgl_node) { + if (LIST_EMPTY(&g_hv_sgl_page_pool.in_use_sgl_list)) { printf("storvsc error: not enough in use sgl\n"); return; } + sgl_node = LIST_FIRST(&g_hv_sgl_page_pool.in_use_sgl_list); + LIST_REMOVE(sgl_node, link); sgl_node->sgl_data = sgl; LIST_INSERT_HEAD(&g_hv_sgl_page_pool.free_sgl_list, sgl_node, link); } @@ -1593,12 +1592,12 @@ storvsc_create_bounce_buffer(uint16_t se struct hv_sgl_node *sgl_node = NULL; /* get struct sglist from free_sgl_list */ - sgl_node = LIST_FIRST(&g_hv_sgl_page_pool.free_sgl_list); - LIST_REMOVE(sgl_node, link); - if (NULL == sgl_node) { + if (LIST_EMPTY(&g_hv_sgl_page_pool.free_sgl_list)) { printf("storvsc error: not enough free sgl\n"); return NULL; } + sgl_node = LIST_FIRST(&g_hv_sgl_page_pool.free_sgl_list); + LIST_REMOVE(sgl_node, link); bounce_sgl = sgl_node->sgl_data; LIST_INSERT_HEAD(&g_hv_sgl_page_pool.in_use_sgl_list, sgl_node, link);