Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753392AbdHRN4g (ORCPT ); Fri, 18 Aug 2017 09:56:36 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:55313 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752671AbdHRNPn (ORCPT ); Fri, 18 Aug 2017 09:15:43 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Johan Hovold" , "Mauro Carvalho Chehab" , "Mauro Carvalho Chehab" , "Hans Verkuil" Date: Fri, 18 Aug 2017 14:13:20 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 033/134] [media] dib0700: fix NULL-deref at probe In-Reply-To: X-SA-Exim-Connect-IP: 82.70.136.246 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1156 Lines: 35 3.16.47-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit d5823511c0f8719a39e72ede1bce65411ac653b7 upstream. Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints. Fixes: c4018fa2e4c0 ("[media] dib0700: fix RC support on Hauppauge Nova-TD") Cc: Mauro Carvalho Chehab Signed-off-by: Johan Hovold Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Ben Hutchings --- drivers/media/usb/dvb-usb/dib0700_core.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/media/usb/dvb-usb/dib0700_core.c +++ b/drivers/media/usb/dvb-usb/dib0700_core.c @@ -769,6 +769,9 @@ int dib0700_rc_setup(struct dvb_usb_devi /* Starting in firmware 1.20, the RC info is provided on a bulk pipe */ + if (intf->altsetting[0].desc.bNumEndpoints < rc_ep + 1) + return -ENODEV; + purb = usb_alloc_urb(0, GFP_KERNEL); if (purb == NULL) { err("rc usb alloc urb failed");