From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:34962 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752145AbeBZUYB (ORCPT ); Mon, 26 Feb 2018 15:24:01 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stefan Windfeldt-Prytz , Jonathan Cameron Subject: [PATCH 4.14 23/54] iio: buffer: check if a buffer has been set up when poll is called Date: Mon, 26 Feb 2018 21:22:00 +0100 Message-Id: <20180226202145.551142113@linuxfoundation.org> In-Reply-To: <20180226202144.375869933@linuxfoundation.org> References: <20180226202144.375869933@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stefan Windfeldt-Prytz commit 4cd140bda6494543f1c1b0ccceceaa44b676eef6 upstream. If no iio buffer has been set up and poll is called return 0. Without this check there will be a null pointer dereference when calling poll on a iio driver without an iio buffer. Cc: stable@vger.kernel.org Signed-off-by: Stefan Windfeldt-Prytz Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/industrialio-buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -175,7 +175,7 @@ unsigned int iio_buffer_poll(struct file struct iio_dev *indio_dev = filp->private_data; struct iio_buffer *rb = indio_dev->buffer; - if (!indio_dev->info) + if (!indio_dev->info || rb == NULL) return 0; poll_wait(filp, &rb->pollq, wait);