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=-3.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS 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 55BA2C65BAF for ; Sun, 9 Dec 2018 22:27:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 246752081F for ; Sun, 9 Dec 2018 22:27:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 246752081F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=decadent.org.uk 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 S1728724AbeLIW1a (ORCPT ); Sun, 9 Dec 2018 17:27:30 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:34682 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726387AbeLIVzM (ORCPT ); Sun, 9 Dec 2018 16:55:12 -0500 Received: from pub.yeoldevic.com ([81.174.156.145] helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1gW72b-0002il-Qm; Sun, 09 Dec 2018 21:55:09 +0000 Received: from ben by deadeye with local (Exim 4.91) (envelope-from ) id 1gW72Z-0003EV-0H; Sun, 09 Dec 2018 21:55:07 +0000 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, "Greg Kroah-Hartman" , "Dan Carpenter" Date: Sun, 09 Dec 2018 21:50:33 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 030/328] vmci: type promotion bug in qp_host_get_user_memory() In-Reply-To: X-SA-Exim-Connect-IP: 81.174.156.145 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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.62-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Dan Carpenter commit 7fb2fd4e25fc1fb10dcb30b5519de257cfeae84c upstream. The problem is that if get_user_pages_fast() fails and returns a negative error code, it gets type promoted to a high positive value and treated as a success. Fixes: 06164d2b72aa ("VMCI: queue pairs implementation.") Signed-off-by: Dan Carpenter Signed-off-by: Greg Kroah-Hartman [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings --- drivers/misc/vmw_vmci/vmci_queue_pair.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/misc/vmw_vmci/vmci_queue_pair.c +++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c @@ -735,7 +735,7 @@ static int qp_host_get_user_memory(u64 p retval = get_user_pages_fast((uintptr_t) produce_uva, produce_q->kernel_if->num_pages, 1, produce_q->kernel_if->u.h.header_page); - if (retval < produce_q->kernel_if->num_pages) { + if (retval < (int)produce_q->kernel_if->num_pages) { pr_warn("get_user_pages(produce) failed (retval=%d)", retval); qp_release_pages(produce_q->kernel_if->u.h.header_page, retval, false); @@ -746,7 +746,7 @@ static int qp_host_get_user_memory(u64 p retval = get_user_pages_fast((uintptr_t) consume_uva, consume_q->kernel_if->num_pages, 1, consume_q->kernel_if->u.h.header_page); - if (retval < consume_q->kernel_if->num_pages) { + if (retval < (int)consume_q->kernel_if->num_pages) { pr_warn("get_user_pages(consume) failed (retval=%d)", retval); qp_release_pages(consume_q->kernel_if->u.h.header_page, retval, false);