From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42110) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d2cvj-0006aa-Qa for qemu-devel@nongnu.org; Mon, 24 Apr 2017 08:17:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d2cvg-0007Om-74 for qemu-devel@nongnu.org; Mon, 24 Apr 2017 08:17:23 -0400 Received: from mx1.redhat.com ([209.132.183.28]:44108) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d2cvg-0007MK-0u for qemu-devel@nongnu.org; Mon, 24 Apr 2017 08:17:20 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D2B4E80F9B for ; Mon, 24 Apr 2017 12:17:15 +0000 (UTC) From: Gerd Hoffmann Date: Mon, 24 Apr 2017 14:16:56 +0200 Message-Id: <20170424121708.31953-2-kraxel@redhat.com> In-Reply-To: <20170424121708.31953-1-kraxel@redhat.com> References: <20170424121708.31953-1-kraxel@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PULL 01/13] console: add same surface replace pre-condition List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Gerd Hoffmann From: Marc-Andr=C3=A9 Lureau Catch an invalid state early, before a potential use-after-free. This is mainly useful for documentation purposes. Signed-off-by: Marc-Andr=C3=A9 Lureau Message-id: 20170406120513.638-2-marcandre.lureau@redhat.com Signed-off-by: Gerd Hoffmann --- ui/console.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/ui/console.c b/ui/console.c index 419b098c11..0cbe5033dd 100644 --- a/ui/console.c +++ b/ui/console.c @@ -1538,6 +1538,8 @@ void dpy_gfx_replace_surface(QemuConsole *con, DisplaySurface *old_surface =3D con->surface; DisplayChangeListener *dcl; =20 + assert(old_surface !=3D surface); + con->surface =3D surface; QLIST_FOREACH(dcl, &s->listeners, next) { if (con !=3D (dcl->con ? dcl->con : active_console)) { --=20 2.9.3