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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,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 9A8CBC5CFEB for ; Wed, 11 Jul 2018 12:30:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 605FE208EC for ; Wed, 11 Jul 2018 12:30:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 605FE208EC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387441AbeGKMeu (ORCPT ); Wed, 11 Jul 2018 08:34:50 -0400 Received: from mga06.intel.com ([134.134.136.31]:36427 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387414AbeGKMeu (ORCPT ); Wed, 11 Jul 2018 08:34:50 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Jul 2018 05:30:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,338,1526367600"; d="scan'208";a="55702693" Received: from twinkler-lnx.jer.intel.com ([10.12.91.43]) by orsmga007.jf.intel.com with ESMTP; 11 Jul 2018 05:30:40 -0700 From: Tomas Winkler To: Greg Kroah-Hartman Cc: Alexander Usyskin , linux-kernel@vger.kernel.org, Tomas Winkler , Dan Carpenter Subject: [char-misc-next 2/2] mei: bus: type promotion bug in mei_fwver() Date: Wed, 11 Jul 2018 15:29:32 +0300 Message-Id: <20180711122932.28197-3-tomas.winkler@intel.com> X-Mailer: git-send-email 2.14.4 In-Reply-To: <20180711122932.28197-1-tomas.winkler@intel.com> References: <20180711122932.28197-1-tomas.winkler@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org if __mei_cl_recv() returns a negative then "bytes_recv" type is promoted to a high positive value in comparison with size_t evaluated by MKHI_FWVER_LEN(1). It results in error condition not to be detected. Cc: Dan Carpenter Fixes: 9078ad92ef86 ("mei: expose fw version to sysfs") Signed-off-by: Tomas Winkler --- drivers/misc/mei/bus-fixup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c index 65e28be3c8cc..4c232f0eae90 100644 --- a/drivers/misc/mei/bus-fixup.c +++ b/drivers/misc/mei/bus-fixup.c @@ -181,7 +181,7 @@ static int mei_fwver(struct mei_cl_device *cldev) ret = 0; bytes_recv = __mei_cl_recv(cldev->cl, buf, sizeof(buf), 0, MKHI_RCV_TIMEOUT); - if (bytes_recv < MKHI_FWVER_LEN(1)) { + if (bytes_recv < 0 || bytes_recv < MKHI_FWVER_LEN(1)) { /* * Should be at least one version block, * error out if nothing found -- 2.14.4