From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9D33C282CE for ; Wed, 22 May 2019 19:48:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C690620856 for ; Wed, 22 May 2019 19:48:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387969AbfEVTsJ (ORCPT ); Wed, 22 May 2019 15:48:09 -0400 Received: from mga01.intel.com ([192.55.52.88]:47986 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732869AbfEVTsE (ORCPT ); Wed, 22 May 2019 15:48:04 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 May 2019 12:48:04 -0700 X-ExtLoop1: 1 Received: from cjpowell-mobl.amr.corp.intel.com (HELO pbossart-mobl3.intel.com) ([10.251.154.39]) by fmsmga008.fm.intel.com with ESMTP; 22 May 2019 12:48:03 -0700 From: Pierre-Louis Bossart To: alsa-devel@alsa-project.org Cc: linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org, vkoul@kernel.org, gregkh@linuxfoundation.org, jank@cadence.com, srinivas.kandagatla@linaro.org, Pierre-Louis Bossart , Sanyog Kale Subject: [PATCH v2 12/15] soundwire: cadence_master: check the number of bidir PDIs Date: Wed, 22 May 2019 14:47:28 -0500 Message-Id: <20190522194732.25704-13-pierre-louis.bossart@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190522194732.25704-1-pierre-louis.bossart@linux.intel.com> References: <20190522194732.25704-1-pierre-louis.bossart@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is an assumption that the first two PDIs are reserved for Bulk, so we need to make sure the number of bidir PDIs is indeed larger than two. If the configuration provided is incorrect, this could lead to allocating a huge amount of memory. Signed-off-by: Pierre-Louis Bossart --- drivers/soundwire/cadence_master.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index a505d74ab461..6a5fa70a8c69 100644 --- a/drivers/soundwire/cadence_master.c +++ b/drivers/soundwire/cadence_master.c @@ -717,6 +717,8 @@ int sdw_cdns_pdi_init(struct sdw_cdns *cdns, stream = &cdns->pcm; /* First two PDIs are reserved for bulk transfers */ + if (stream->num_bd < CDNS_PCM_PDI_OFFSET) + return -EINVAL; stream->num_bd -= CDNS_PCM_PDI_OFFSET; offset = CDNS_PCM_PDI_OFFSET; -- 2.20.1