From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:47674 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031848AbbKFTcB (ORCPT ); Fri, 6 Nov 2015 14:32:01 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Laura Abbott , Mauro Carvalho Chehab Subject: [PATCH 4.1 15/86] [media] si2157: Bounds check firmware Date: Fri, 6 Nov 2015 11:22:14 -0800 Message-Id: <20151106192206.152163262@linuxfoundation.org> In-Reply-To: <20151106192205.351595349@linuxfoundation.org> References: <20151106192205.351595349@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: stable-owner@vger.kernel.org List-ID: 4.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Laura Abbott commit a828d72df216c36e9c40b6c24dc4b17b6f7b5a76 upstream. When reading the firmware and sending commands, the length must be bounds checked to avoid overrunning the size of the command buffer and smashing the stack if the firmware is not in the expected format. Add the proper check. Signed-off-by: Laura Abbott Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/tuners/si2157.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/media/tuners/si2157.c +++ b/drivers/media/tuners/si2157.c @@ -165,6 +165,10 @@ static int si2157_init(struct dvb_fronte for (remaining = fw->size; remaining > 0; remaining -= 17) { len = fw->data[fw->size - remaining]; + if (len > SI2157_ARGLEN) { + dev_err(&client->dev, "Bad firmware length\n"); + goto err_release_firmware; + } memcpy(cmd.args, &fw->data[(fw->size - remaining) + 1], len); cmd.wlen = len; cmd.rlen = 1;