From patchwork Tue Jul 3 03:46:53 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Cody X-Patchwork-Id: 10502907 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8B6726028F for ; Tue, 3 Jul 2018 03:50:26 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6E66228AA5 for ; Tue, 3 Jul 2018 03:50:26 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 608B628AC0; Tue, 3 Jul 2018 03:50:26 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI 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 F3A9C28AA5 for ; Tue, 3 Jul 2018 03:50:25 +0000 (UTC) Received: from localhost ([::1]:37663 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1faCKe-0006W6-Q8 for patchwork-qemu-devel@patchwork.kernel.org; Mon, 02 Jul 2018 23:50:24 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49283) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1faCHe-0004Tr-CE for qemu-devel@nongnu.org; Mon, 02 Jul 2018 23:47:20 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1faCHd-0001nH-IB for qemu-devel@nongnu.org; Mon, 02 Jul 2018 23:47:18 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42084) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1faCHY-0001kj-VK; Mon, 02 Jul 2018 23:47:13 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 23A1D285B4; Tue, 3 Jul 2018 03:47:12 +0000 (UTC) Received: from localhost (ovpn-117-102.phx2.redhat.com [10.3.117.102]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2903760A9A; Tue, 3 Jul 2018 03:47:04 +0000 (UTC) From: Jeff Cody To: qemu-block@nongnu.org Date: Mon, 2 Jul 2018 23:46:53 -0400 Message-Id: <20180703034655.792039-2-jcody@redhat.com> In-Reply-To: <20180703034655.792039-1-jcody@redhat.com> References: <20180703034655.792039-1-jcody@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Tue, 03 Jul 2018 03:47:12 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 1/3] block: Fix parameter checking in bdrv_co_copy_range_internal 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: peter.maydell@linaro.org, Jeff Cody , Fam Zheng , qemu-devel@nongnu.org, Stefan Hajnoczi Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Fam Zheng src may be NULL if BDRV_REQ_ZERO_WRITE flag is set, in this case only check dst and dst->bs. This bug was introduced when moving in the request tracking code from bdrv_co_copy_range, in 37aec7d75eb. This especially fixes the possible segfault when initializing src_bs with a NULL src. Signed-off-by: Fam Zheng Message-id: 20180703023758.14422-2-famz@redhat.com Reviewed-by: Jeff Cody Signed-off-by: Jeff Cody --- block/io.c | 29 +++++++++++++++-------------- 1 file changed, 15 insertions(+), 14 deletions(-) diff --git a/block/io.c b/block/io.c index 7035b78a20..b8845708d7 100644 --- a/block/io.c +++ b/block/io.c @@ -2897,18 +2897,11 @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src, bool recurse_src) { BdrvTrackedRequest src_req, dst_req; - BlockDriverState *src_bs = src->bs; - BlockDriverState *dst_bs = dst->bs; int ret; - if (!src || !dst || !src->bs || !dst->bs) { + if (!dst || !dst->bs) { return -ENOMEDIUM; } - ret = bdrv_check_byte_request(src->bs, src_offset, bytes); - if (ret) { - return ret; - } - ret = bdrv_check_byte_request(dst->bs, dst_offset, bytes); if (ret) { return ret; @@ -2917,16 +2910,24 @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src, return bdrv_co_pwrite_zeroes(dst, dst_offset, bytes, flags); } + if (!src || !src->bs) { + return -ENOMEDIUM; + } + ret = bdrv_check_byte_request(src->bs, src_offset, bytes); + if (ret) { + return ret; + } + if (!src->bs->drv->bdrv_co_copy_range_from || !dst->bs->drv->bdrv_co_copy_range_to || src->bs->encrypted || dst->bs->encrypted) { return -ENOTSUP; } - bdrv_inc_in_flight(src_bs); - bdrv_inc_in_flight(dst_bs); - tracked_request_begin(&src_req, src_bs, src_offset, + bdrv_inc_in_flight(src->bs); + bdrv_inc_in_flight(dst->bs); + tracked_request_begin(&src_req, src->bs, src_offset, bytes, BDRV_TRACKED_READ); - tracked_request_begin(&dst_req, dst_bs, dst_offset, + tracked_request_begin(&dst_req, dst->bs, dst_offset, bytes, BDRV_TRACKED_WRITE); wait_serialising_requests(&src_req); @@ -2944,8 +2945,8 @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src, } tracked_request_end(&src_req); tracked_request_end(&dst_req); - bdrv_dec_in_flight(src_bs); - bdrv_dec_in_flight(dst_bs); + bdrv_dec_in_flight(src->bs); + bdrv_dec_in_flight(dst->bs); return ret; }