From patchwork Tue Mar 8 07:52:34 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 593913 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 987071401AF for ; Tue, 8 Mar 2016 18:53:44 +1100 (AEDT) Received: from localhost ([::1]:32803 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adCSc-0005pq-P9 for incoming@patchwork.ozlabs.org; Tue, 08 Mar 2016 02:53:42 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33324) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adCS5-0004lp-FI for qemu-devel@nongnu.org; Tue, 08 Mar 2016 02:53:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1adCS0-0000Ar-JL for qemu-devel@nongnu.org; Tue, 08 Mar 2016 02:53:09 -0500 Received: from mx1.redhat.com ([209.132.183.28]:47956) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adCS0-0000An-EL for qemu-devel@nongnu.org; Tue, 08 Mar 2016 02:53:04 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id 8FE036540C; Tue, 8 Mar 2016 07:53:03 +0000 (UTC) Received: from jason-ThinkPad-T430s.redhat.com (vpn1-5-240.pek2.redhat.com [10.72.5.240]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u287qkMY010527; Tue, 8 Mar 2016 02:52:59 -0500 From: Jason Wang To: peter.maydell@linaro.org, qemu-devel@nongnu.org Date: Tue, 8 Mar 2016 15:52:34 +0800 Message-Id: <1457423564-9724-3-git-send-email-jasowang@redhat.com> In-Reply-To: <1457423564-9724-1-git-send-email-jasowang@redhat.com> References: <1457423564-9724-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Tue, 08 Mar 2016 07:53:04 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Cc: Jason Wang , Yang Hongyang Subject: [Qemu-devel] [PULL V2 02/12] net: filter: correctly remove filter from the list during finalization X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Qemu may crash when we want to add two filters on the same netdev but the initialization of second fails (e.g missing parameters): ./qemu-system-x86_64 -netdev user,id=un0 \ -object filter-buffer,id=f0,netdev=un0,interval=10 \ -object filter-buffer,id=f1,netdev=un0 Segmentation fault (core dumped) This is because we don't check whether or not the filter was in the list of netdev. This patch fixes this. Cc: Yang Hongyang Reviewed-by: Yang Hongyang Signed-off-by: Jason Wang --- net/filter.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/filter.c b/net/filter.c index d2a514e..7cdbc6c 100644 --- a/net/filter.c +++ b/net/filter.c @@ -196,7 +196,8 @@ static void netfilter_finalize(Object *obj) nfc->cleanup(nf); } - if (nf->netdev && !QTAILQ_EMPTY(&nf->netdev->filters)) { + if (nf->netdev && !QTAILQ_EMPTY(&nf->netdev->filters) && + nf->next.tqe_prev) { QTAILQ_REMOVE(&nf->netdev->filters, nf, next); } g_free(nf->netdev_id);