From nobody Wed Oct 29 09:06:55 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1524825173122790.0883063029434; Fri, 27 Apr 2018 03:32:53 -0700 (PDT) Received: from localhost ([::1]:47147 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fC0gM-00026G-AW for importer@patchew.org; Fri, 27 Apr 2018 06:32:50 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41094) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fC05R-0007NS-8y for qemu-devel@nongnu.org; Fri, 27 Apr 2018 05:54:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fC05Q-0001eI-Jx for qemu-devel@nongnu.org; Fri, 27 Apr 2018 05:54:41 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:36838 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fC05Q-0001e3-E6 for qemu-devel@nongnu.org; Fri, 27 Apr 2018 05:54:40 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id EAE3B722FC for ; Fri, 27 Apr 2018 09:54:39 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-116-59.ams2.redhat.com [10.36.116.59]) by smtp.corp.redhat.com (Postfix) with ESMTP id 44FC2AB3F3; Fri, 27 Apr 2018 09:54:35 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 342A331E63; Fri, 27 Apr 2018 11:54:34 +0200 (CEST) From: Gerd Hoffmann To: qemu-devel@nongnu.org Date: Fri, 27 Apr 2018 11:54:29 +0200 Message-Id: <20180427095434.14013-2-kraxel@redhat.com> In-Reply-To: <20180427095434.14013-1-kraxel@redhat.com> References: <20180427095434.14013-1-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Fri, 27 Apr 2018 09:54:39 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Fri, 27 Apr 2018 09:54:39 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'kraxel@redhat.com' RCPT:'' Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PULL 1/6] vnc: fix use-after-free 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: Paolo Bonzini , Alex Williamson , Markus Armbruster , Gerd Hoffmann Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" When vnc_client_read() return value is -1 vs is not valid any more. Fixes: d49b87f0d1e0520443a990fc610d0f02bc63c556 Reported-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Gerd Hoffmann Reviewed-by: Marc-Andr=C3=A9 Lureau Reviewed-by: Daniel P. Berrang=C3=A9 Reviewed-by: Philippe Mathieu-Daud=C3=A9 Tested-by: Marc-Andr=C3=A9 Lureau Tested-by: Philippe Mathieu-Daud=C3=A9 Message-id: 20180420084820.3873-1-kraxel@redhat.com --- ui/vnc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/ui/vnc.c b/ui/vnc.c index e164eb798c..5526e54f48 100644 --- a/ui/vnc.c +++ b/ui/vnc.c @@ -1539,13 +1539,14 @@ gboolean vnc_client_io(QIOChannel *ioc G_GNUC_UNUSE= D, VncState *vs =3D opaque; if (condition & G_IO_IN) { if (vnc_client_read(vs) < 0) { - goto end; + /* vs is free()ed here */ + return TRUE; } } if (condition & G_IO_OUT) { vnc_client_write(vs); } -end: + if (vs->disconnecting) { if (vs->ioc_tag !=3D 0) { g_source_remove(vs->ioc_tag); --=20 2.9.3