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 1EA8CC49ED7 for ; Thu, 19 Sep 2019 22:25:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DA29320678 for ; Thu, 19 Sep 2019 22:25:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568931927; bh=YPQUVoNFly186FGiihx6pRJ6rB1JjNJQOT4c6Wej2H4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=bn41vmCa5dhDZYv69QN4WBkisbySjnM4tsTbrVYYXEUCGdqYUMuauWhd01Z3LAtLh w5R/WdJ3q6ukEFliwjItPk59vQZ/5sQwDAH8fDmY2Wy/7NWgR+xMfw94Nf56oWTxyb K9sDcBflQXUnbFYjyFPXs8wx3Hj3PIG6aI3dOlU4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436538AbfISWZ0 (ORCPT ); Thu, 19 Sep 2019 18:25:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:39830 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2407057AbfISWXx (ORCPT ); Thu, 19 Sep 2019 18:23:53 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 5356521920; Thu, 19 Sep 2019 22:23:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568931833; bh=YPQUVoNFly186FGiihx6pRJ6rB1JjNJQOT4c6Wej2H4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hJN+L7tQn2bh3hjTlpk/Tco3E78Ch8x3Mf4rD745NjDvBrrkW+YCXr0HGfFhAEQys uA7N0Q2qUrS/DUYBD4S1ij95hmdQT3hIhe2BQU9zbtzUWNBoUCzzeuRo4jH6dSm78X /C6t4bZdafa5Wf/4LtrMUZZMhcK0iD1rDAe98JDk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+eaaaf38a95427be88f4b@syzkaller.appspotmail.com, Sean Young , Kees Cook , Mauro Carvalho Chehab Subject: [PATCH 4.4 55/56] media: technisat-usb2: break out of loop at end of buffer Date: Fri, 20 Sep 2019 00:04:36 +0200 Message-Id: <20190919214805.053463953@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190919214742.483643642@linuxfoundation.org> References: <20190919214742.483643642@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 0c4df39e504bf925ab666132ac3c98d6cbbe380b upstream. Ensure we do not access the buffer beyond the end if no 0xff byte is encountered. Reported-by: syzbot+eaaaf38a95427be88f4b@syzkaller.appspotmail.com Signed-off-by: Sean Young Reviewed-by: Kees Cook Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/usb/dvb-usb/technisat-usb2.c | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-) --- a/drivers/media/usb/dvb-usb/technisat-usb2.c +++ b/drivers/media/usb/dvb-usb/technisat-usb2.c @@ -594,9 +594,9 @@ static int technisat_usb2_frontend_attac static int technisat_usb2_get_ir(struct dvb_usb_device *d) { - u8 buf[62], *b; - int ret; + u8 buf[62]; struct ir_raw_event ev; + int i, ret; buf[0] = GET_IR_DATA_VENDOR_REQUEST; buf[1] = 0x08; @@ -632,26 +632,25 @@ unlock: return 0; /* no key pressed */ /* decoding */ - b = buf+1; #if 0 deb_rc("RC: %d ", ret); - debug_dump(b, ret, deb_rc); + debug_dump(buf + 1, ret, deb_rc); #endif ev.pulse = 0; - while (1) { - ev.pulse = !ev.pulse; - ev.duration = (*b * FIRMWARE_CLOCK_DIVISOR * FIRMWARE_CLOCK_TICK) / 1000; - ir_raw_event_store(d->rc_dev, &ev); - - b++; - if (*b == 0xff) { + for (i = 1; i < ARRAY_SIZE(buf); i++) { + if (buf[i] == 0xff) { ev.pulse = 0; ev.duration = 888888*2; ir_raw_event_store(d->rc_dev, &ev); break; } + + ev.pulse = !ev.pulse; + ev.duration = (buf[i] * FIRMWARE_CLOCK_DIVISOR * + FIRMWARE_CLOCK_TICK) / 1000; + ir_raw_event_store(d->rc_dev, &ev); } ir_raw_event_handle(d->rc_dev);