Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946032AbbGaUzo (ORCPT ); Fri, 31 Jul 2015 16:55:44 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:47537 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1945893AbbGaUNO (ORCPT ); Fri, 31 Jul 2015 16:13:14 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mauro Carvalho Chehab Subject: [PATCH 3.14 046/125] [media] cx24117: fix a buffer overflow when checking userspace params Date: Fri, 31 Jul 2015 12:40:46 -0700 Message-Id: <20150731194028.762187315@linuxfoundation.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: <20150731194027.037807932@linuxfoundation.org> References: <20150731194027.037807932@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1249 Lines: 37 3.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mauro Carvalho Chehab commit 82e3b88b679049f043fe9b03991d6d66fc0a43c8 upstream. The maximum size for a DiSEqC command is 6, according to the userspace API. However, the code allows to write up much more values: drivers/media/dvb-frontends/cx24116.c:983 cx24116_send_diseqc_msg() error: buffer overflow 'd->msg' 6 <= 23 Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/dvb-frontends/cx24117.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/media/dvb-frontends/cx24117.c +++ b/drivers/media/dvb-frontends/cx24117.c @@ -1043,7 +1043,7 @@ static int cx24117_send_diseqc_msg(struc dev_dbg(&state->priv->i2c->dev, ")\n"); /* Validate length */ - if (d->msg_len > 15) + if (d->msg_len > sizeof(d->msg)) return -EINVAL; /* DiSEqC message */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/