From patchwork Thu Mar 7 11:51:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Samuel Thibault X-Patchwork-Id: 10842713 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 29B251669 for ; Thu, 7 Mar 2019 11:58:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1508F2E47A for ; Thu, 7 Mar 2019 11:58:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0573A2E4A3; Thu, 7 Mar 2019 11:58:48 +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=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A02002E47A for ; Thu, 7 Mar 2019 11:58:47 +0000 (UTC) Received: from localhost ([127.0.0.1]:49834 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h1rfj-0005nU-0Y for patchwork-qemu-devel@patchwork.kernel.org; Thu, 07 Mar 2019 06:58:47 -0500 Received: from eggs.gnu.org ([209.51.188.92]:36139) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h1rZ1-0008Nc-A9 for qemu-devel@nongnu.org; Thu, 07 Mar 2019 06:51:51 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1h1rZ0-0003Vz-KB for qemu-devel@nongnu.org; Thu, 07 Mar 2019 06:51:51 -0500 Received: from hera.aquilenet.fr ([2a0c:e300::1]:35528) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1h1rZ0-0003V9-Cv; Thu, 07 Mar 2019 06:51:50 -0500 Received: from localhost (localhost [127.0.0.1]) by hera.aquilenet.fr (Postfix) with ESMTP id 61DFAB158; Thu, 7 Mar 2019 12:51:49 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at aquilenet.fr Received: from hera.aquilenet.fr ([127.0.0.1]) by localhost (hera.aquilenet.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1w5S2bPvildP; Thu, 7 Mar 2019 12:51:48 +0100 (CET) Received: from function (dhcp-13-128.lip.ens-lyon.fr [140.77.13.128]) by hera.aquilenet.fr (Postfix) with ESMTPSA id 6D7D7B160; Thu, 7 Mar 2019 12:51:44 +0100 (CET) Received: from samy by function with local (Exim 4.92) (envelope-from ) id 1h1rYt-0000Dm-DZ; Thu, 07 Mar 2019 12:51:43 +0100 From: Samuel Thibault To: qemu-devel@nongnu.org Date: Thu, 7 Mar 2019 12:51:34 +0100 Message-Id: <20190307115143.780-5-samuel.thibault@ens-lyon.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190307115143.780-1-samuel.thibault@ens-lyon.org> References: <20190307115143.780-1-samuel.thibault@ens-lyon.org> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a0c:e300::1 Subject: [Qemu-devel] [PULLv2 03/12] slirp: check sscanf result when emulating ident 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, secalert@redhat.com, jan.kiszka@siemens.com, qemu-stable@nongnu.org, William Bowling , stefanha@redhat.com, Samuel Thibault , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: William Bowling When emulating ident in tcp_emu, if the strchr checks passed but the sscanf check failed, two uninitialized variables would be copied and sent in the reply, so move this code inside the if(sscanf()) clause. Signed-off-by: William Bowling Cc: qemu-stable@nongnu.org Cc: secalert@redhat.com Message-Id: <1551476756-25749-1-git-send-email-will@wbowling.info> Signed-off-by: Samuel Thibault Reviewed-by: Philippe Mathieu-Daudé --- slirp/tcp_subr.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c index 262a42d6c8..ef9d99c154 100644 --- a/slirp/tcp_subr.c +++ b/slirp/tcp_subr.c @@ -664,12 +664,12 @@ tcp_emu(struct socket *so, struct mbuf *m) break; } } + so_rcv->sb_cc = snprintf(so_rcv->sb_data, + so_rcv->sb_datalen, + "%d,%d\r\n", n1, n2); + so_rcv->sb_rptr = so_rcv->sb_data; + so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc; } - so_rcv->sb_cc = snprintf(so_rcv->sb_data, - so_rcv->sb_datalen, - "%d,%d\r\n", n1, n2); - so_rcv->sb_rptr = so_rcv->sb_data; - so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc; } m_free(m); return 0;