From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965702AbcHNLeo (ORCPT ); Sun, 14 Aug 2016 07:34:44 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:52439 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965640AbcHNLdh (ORCPT ); Sun, 14 Aug 2016 07:33:37 -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, george.mccollister@gmail.com, "Jonathan Cameron" , "Matt Ranostay" Date: Sat, 13 Aug 2016 18:42:51 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 165/305] iio: proximity: as3935: fix buffer stack trashing In-Reply-To: X-SA-Exim-Connect-IP: 92.40.249.202 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 3.16.37-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Matt Ranostay commit 37b1ba2c68cfbe37f5f45bb91bcfaf2b016ae6a1 upstream. Buffer wasn't of a valid size to allow the timestamp, and correct padding. This patchset also moves the buffer off the stack, and onto the heap. Cc: george.mccollister@gmail.com Signed-off-by: Matt Ranostay Signed-off-by: Jonathan Cameron Signed-off-by: Ben Hutchings --- drivers/iio/proximity/as3935.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/iio/proximity/as3935.c +++ b/drivers/iio/proximity/as3935.c @@ -64,6 +64,7 @@ struct as3935_state { struct delayed_work work; u32 tune_cap; + u8 buffer[16]; /* 8-bit data + 56-bit padding + 64-bit timestamp */ u8 buf[2] ____cacheline_aligned; }; @@ -212,9 +213,10 @@ static irqreturn_t as3935_trigger_handle ret = as3935_read(st, AS3935_DATA, &val); if (ret) goto err_read; - val &= AS3935_DATA_MASK; - iio_push_to_buffers_with_timestamp(indio_dev, &val, pf->timestamp); + st->buffer[0] = val & AS3935_DATA_MASK; + iio_push_to_buffers_with_timestamp(indio_dev, &st->buffer, + pf->timestamp); err_read: iio_trigger_notify_done(indio_dev->trig);