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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 5040AC4646B for ; Wed, 26 Jun 2019 03:46:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 274BC217D6 for ; Wed, 26 Jun 2019 03:46:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561520800; bh=6dWU0dNv9cYf+yPMs3W3XUy0ihTiE85lp1iKoVZoxn0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=noB4Z36p/G5IwD/U/d7RlMpr5iKYgaPEaj35F4ZieTcWxqQh/vOUtqDE7YIsNb+Ww 9Fj/cOt2U1/a0i770bRNG/F0wOBET1doPXgv20/hJDQajXBTRmeV3VPBS242CVR17M 77+9Gr0gkAqZY300XEmnlCKs4GvnHBQWnh08dLcQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728015AbfFZDqi (ORCPT ); Tue, 25 Jun 2019 23:46:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:58392 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727001AbfFZDqh (ORCPT ); Tue, 25 Jun 2019 23:46:37 -0400 Received: from sasha-vm.mshome.net (mobile-107-77-172-82.mobile.att.net [107.77.172.82]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 20FF7208CB; Wed, 26 Jun 2019 03:46:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561520796; bh=6dWU0dNv9cYf+yPMs3W3XUy0ihTiE85lp1iKoVZoxn0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MjTBTwPXskrnUj7eqa3LdcHIaQRzIHGii9RFD/cg5l19l4WqC1hpOj8gbYUJZC0vK u93ZCujT4smTzV8SKGtlUBzyo7QqhzXZKWsXzZltDjN9YEZ0G4KENvMhVi352IqLiU qlFqtyjQcV4dLOqbfl4eyYqpBhC1KTFdmJh8Vggc= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: swkhack , Michal Hocko , Andrew Morton , Linus Torvalds , Sasha Levin , linux-mm@kvack.org Subject: [PATCH AUTOSEL 4.9 11/11] mm/mlock.c: change count_mm_mlocked_page_nr return type Date: Tue, 25 Jun 2019 23:46:01 -0400 Message-Id: <20190626034602.24367-11-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190626034602.24367-1-sashal@kernel.org> References: <20190626034602.24367-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: swkhack [ Upstream commit 0874bb49bb21bf24deda853e8bf61b8325e24bcb ] On a 64-bit machine the value of "vma->vm_end - vma->vm_start" may be negative when using 32 bit ints and the "count >> PAGE_SHIFT"'s result will be wrong. So change the local variable and return value to unsigned long to fix the problem. Link: http://lkml.kernel.org/r/20190513023701.83056-1-swkhack@gmail.com Fixes: 0cf2f6f6dc60 ("mm: mlock: check against vma for actual mlock() size") Signed-off-by: swkhack Acked-by: Michal Hocko Reviewed-by: Andrew Morton Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/mlock.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/mlock.c b/mm/mlock.c index f0505692a5f4..3e7fe404bfb8 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -630,11 +630,11 @@ static int apply_vma_lock_flags(unsigned long start, size_t len, * is also counted. * Return value: previously mlocked page counts */ -static int count_mm_mlocked_page_nr(struct mm_struct *mm, +static unsigned long count_mm_mlocked_page_nr(struct mm_struct *mm, unsigned long start, size_t len) { struct vm_area_struct *vma; - int count = 0; + unsigned long count = 0; if (mm == NULL) mm = current->mm; -- 2.20.1