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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 819B3C433EF for ; Wed, 3 Nov 2021 09:48:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 665D861183 for ; Wed, 3 Nov 2021 09:48:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231939AbhKCJvP (ORCPT ); Wed, 3 Nov 2021 05:51:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:60024 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231894AbhKCJvP (ORCPT ); Wed, 3 Nov 2021 05:51:15 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 81B8360720; Wed, 3 Nov 2021 09:48:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1635932919; bh=Mba08frmKBmP/zirJ05TTi/sb5yu0f/6yZK4I0mFUmw=; h=Subject:To:Cc:From:Date:From; b=kuXYpH9EXz9JuoTH3vtnMcB4b8uTRSITIqhaugkTBfjGIi+3N5IBHsq/3nRxAx1+N 16slfo5IRjKR9RqnbPPsGzrteVoFeMMYwUumrm8cRj1v+yQSiIqKy1uHAhEvRFQAcu 4i+C0iI4yKoCTv3rQ+nrDEBHbZl/dt5KWt0ZhIQY= Subject: FAILED: patch "[PATCH] media: firewire: firedtv-avc: fix a buffer overflow in" failed to apply to 4.9-stable tree To: dan.carpenter@oracle.com, hverkuil-cisco@xs4all.nl, luolikang@nsfocus.com, mchehab+huawei@kernel.org Cc: From: Date: Wed, 03 Nov 2021 10:48:26 +0100 Message-ID: <163593290623159@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 35d2969ea3c7d32aee78066b1f3cf61a0d935a4e Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Mon, 7 Jun 2021 17:23:48 +0200 Subject: [PATCH] media: firewire: firedtv-avc: fix a buffer overflow in avc_ca_pmt() The bounds checking in avc_ca_pmt() is not strict enough. It should be checking "read_pos + 4" because it's reading 5 bytes. If the "es_info_length" is non-zero then it reads a 6th byte so there needs to be an additional check for that. I also added checks for the "write_pos". I don't think these are required because "read_pos" and "write_pos" are tied together so checking one ought to be enough. But they make the code easier to understand for me. The check on write_pos is: if (write_pos + 4 >= sizeof(c->operand) - 4) { The first "+ 4" is because we're writing 5 bytes and the last " - 4" is to leave space for the CRC. The other problem is that "length" can be invalid. It comes from "data_length" in fdtv_ca_pmt(). Cc: stable@vger.kernel.org Reported-by: Luo Likang Signed-off-by: Dan Carpenter Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab diff --git a/drivers/media/firewire/firedtv-avc.c b/drivers/media/firewire/firedtv-avc.c index 2bf9467b917d..71991f8638e6 100644 --- a/drivers/media/firewire/firedtv-avc.c +++ b/drivers/media/firewire/firedtv-avc.c @@ -1165,7 +1165,11 @@ int avc_ca_pmt(struct firedtv *fdtv, char *msg, int length) read_pos += program_info_length; write_pos += program_info_length; } - while (read_pos < length) { + while (read_pos + 4 < length) { + if (write_pos + 4 >= sizeof(c->operand) - 4) { + ret = -EINVAL; + goto out; + } c->operand[write_pos++] = msg[read_pos++]; c->operand[write_pos++] = msg[read_pos++]; c->operand[write_pos++] = msg[read_pos++]; @@ -1177,13 +1181,17 @@ int avc_ca_pmt(struct firedtv *fdtv, char *msg, int length) c->operand[write_pos++] = es_info_length >> 8; c->operand[write_pos++] = es_info_length & 0xff; if (es_info_length > 0) { + if (read_pos >= length) { + ret = -EINVAL; + goto out; + } pmt_cmd_id = msg[read_pos++]; if (pmt_cmd_id != 1 && pmt_cmd_id != 4) dev_err(fdtv->device, "invalid pmt_cmd_id %d at stream level\n", pmt_cmd_id); - if (es_info_length > sizeof(c->operand) - 4 - - write_pos) { + if (es_info_length > sizeof(c->operand) - 4 - write_pos || + es_info_length > length - read_pos) { ret = -EINVAL; goto out; } diff --git a/drivers/media/firewire/firedtv-ci.c b/drivers/media/firewire/firedtv-ci.c index 9363d005e2b6..e0d57e09dab0 100644 --- a/drivers/media/firewire/firedtv-ci.c +++ b/drivers/media/firewire/firedtv-ci.c @@ -134,6 +134,8 @@ static int fdtv_ca_pmt(struct firedtv *fdtv, void *arg) } else { data_length = msg->msg[3]; } + if (data_length > sizeof(msg->msg) - data_pos) + return -EINVAL; return avc_ca_pmt(fdtv, &msg->msg[data_pos], data_length); }