From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932779AbcHNR7n (ORCPT ); Sun, 14 Aug 2016 13:59:43 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:54942 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932754AbcHNR7l (ORCPT ); Sun, 14 Aug 2016 13:59:41 -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, "Dan Carpenter" , "Takashi Iwai" Date: Sat, 13 Aug 2016 18:42:51 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 273/305] ALSA: compress: fix an integer overflow check 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: Dan Carpenter commit 6217e5ede23285ddfee10d2e4ba0cc2d4c046205 upstream. I previously added an integer overflow check here but looking at it now, it's still buggy. The bug happens in snd_compr_allocate_buffer(). We multiply ".fragments" and ".fragment_size" and that doesn't overflow but then we save it in an unsigned int so it truncates the high bits away and we allocate a smaller than expected size. Fixes: b35cc8225845 ('ALSA: compress_core: integer overflow in snd_compr_allocate_buffer()') Signed-off-by: Dan Carpenter Signed-off-by: Takashi Iwai Signed-off-by: Ben Hutchings --- sound/core/compress_offload.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/sound/core/compress_offload.c +++ b/sound/core/compress_offload.c @@ -500,7 +500,7 @@ static int snd_compress_check_input(stru { /* first let's check the buffer parameter's */ if (params->buffer.fragment_size == 0 || - params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size) + params->buffer.fragments > INT_MAX / params->buffer.fragment_size) return -EINVAL; /* now codec parameters */