From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9DB2FC35247 for ; Mon, 3 Feb 2020 16:38:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 71BB224654 for ; Mon, 3 Feb 2020 16:38:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580747880; bh=6DmBolbtfr5xFdGIY7cFqc5o5dNUZ0YZKeKqRMpNUGo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ngyqQu0SdsMlVrxyKsx71wFY9yiEBZDSHtbzBzEPC+jf3R8aj0Lw2gflaocG1Tfx6 GSDDq2a5PqiSi9KFr0Qtchau8iBgW8nscTT0c1W70Kgkvz3yj8vBgHBwfsTR8lxP/E I7IrcnNqZwSuwpZ6z6RhxefKZFe0PMlHmhUdR50A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730664AbgBCQh6 (ORCPT ); Mon, 3 Feb 2020 11:37:58 -0500 Received: from mail.kernel.org ([198.145.29.99]:53566 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730901AbgBCQhv (ORCPT ); Mon, 3 Feb 2020 11:37:51 -0500 Received: from localhost (unknown [104.132.45.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 40B222051A; Mon, 3 Feb 2020 16:37:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580747870; bh=6DmBolbtfr5xFdGIY7cFqc5o5dNUZ0YZKeKqRMpNUGo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XFTXoiWpx+4ORXBgj6f4eH8eaX49e33TolgRsSKXO9Ypxh5lE/zbKpVarCXHV5mHT O5YuNM9samnPc1Gw1oeYL7Nq7InyNheV6DNCkKXIRXlrr8qNH+H9ep2vPLgIsVUwKA p6X63COqwcO82u6nCs9mKIxCiFRKoyonBGt7gbKw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+6bf9606ee955b646c0e1@syzkaller.appspotmail.com, Sean Young , Mauro Carvalho Chehab Subject: [PATCH 5.5 15/23] media: digitv: dont continue if remote control state cant be read Date: Mon, 3 Feb 2020 16:20:35 +0000 Message-Id: <20200203161905.564349234@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200203161902.288335885@linuxfoundation.org> References: <20200203161902.288335885@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sean Young commit eecc70d22ae51225de1ef629c1159f7116476b2e upstream. This results in an uninitialized variable read. Reported-by: syzbot+6bf9606ee955b646c0e1@syzkaller.appspotmail.com Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/usb/dvb-usb/digitv.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) --- a/drivers/media/usb/dvb-usb/digitv.c +++ b/drivers/media/usb/dvb-usb/digitv.c @@ -230,18 +230,22 @@ static struct rc_map_table rc_map_digitv static int digitv_rc_query(struct dvb_usb_device *d, u32 *event, int *state) { - int i; + int ret, i; u8 key[5]; u8 b[4] = { 0 }; *event = 0; *state = REMOTE_NO_KEY_PRESSED; - digitv_ctrl_msg(d,USB_READ_REMOTE,0,NULL,0,&key[1],4); + ret = digitv_ctrl_msg(d, USB_READ_REMOTE, 0, NULL, 0, &key[1], 4); + if (ret) + return ret; /* Tell the device we've read the remote. Not sure how necessary this is, but the Nebula SDK does it. */ - digitv_ctrl_msg(d,USB_WRITE_REMOTE,0,b,4,NULL,0); + ret = digitv_ctrl_msg(d, USB_WRITE_REMOTE, 0, b, 4, NULL, 0); + if (ret) + return ret; /* if something is inside the buffer, simulate key press */ if (key[1] != 0)