From patchwork Tue Jun 29 02:39:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 12349123 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 DC0A8C11F66 for ; Tue, 29 Jun 2021 02:39:49 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A806661C71 for ; Tue, 29 Jun 2021 02:39:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A806661C71 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 08DBB8D00F1; Mon, 28 Jun 2021 22:39:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0566D8D00F0; Mon, 28 Jun 2021 22:39:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E391E8D00F1; Mon, 28 Jun 2021 22:39:48 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0026.hostedemail.com [216.40.44.26]) by kanga.kvack.org (Postfix) with ESMTP id C0FCD8D00F0 for ; Mon, 28 Jun 2021 22:39:48 -0400 (EDT) Received: from smtpin31.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id C302D1F86E for ; Tue, 29 Jun 2021 02:39:48 +0000 (UTC) X-FDA: 78305206056.31.A6A90EE Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf19.hostedemail.com (Postfix) with ESMTP id 840E59001E6C for ; Tue, 29 Jun 2021 02:39:48 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 8DC78619AB; Tue, 29 Jun 2021 02:39:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1624934387; bh=FRzd6PJrVcPNI3ccFCj0MtDNk36pHF7pK9QzEFECNUg=; h=Date:From:To:Subject:In-Reply-To:From; b=GfHas/+vqz+SIe3M6Yhi7KSWBNnAh3xk6yOksoWyITz8sSJ31oa+0uYB2Pz/f82lV DPr2FWd6USRPQ5PD+mr8o5IIuodm88d16HZMjSvEvD33bAUjW6Aq5WDcDfG8JbRC3z K5bwItMVsOPdTktD+jSgRWqfTMRqy0lb65eNh3lc= Date: Mon, 28 Jun 2021 19:39:47 -0700 From: Andrew Morton To: akpm@linux-foundation.org, david@redhat.com, dbueso@suse.de, geert@linux-m68k.org, ldufour@linux.ibm.com, Liam.Howlett@Oracle.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 124/192] mm/mremap: use vma_lookup() in vma_to_resize() Message-ID: <20210629023947.nySF3mwFM%akpm@linux-foundation.org> In-Reply-To: <20210628193256.008961950a714730751c1423@linux-foundation.org> User-Agent: s-nail v14.8.16 Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b="GfHas/+v"; dmarc=none; spf=pass (imf19.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Stat-Signature: bozinnrzu83wkaeoc3nz9xsjyeb1xb5u X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 840E59001E6C X-HE-Tag: 1624934388-44993 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Liam Howlett Subject: mm/mremap: use vma_lookup() in vma_to_resize() Use vma_lookup() to find the VMA at a specific address. As vma_lookup() will return NULL if the address is not within any VMA, the start address no longer needs to be validated. Link: https://lkml.kernel.org/r/20210521174745.2219620-21-Liam.Howlett@Oracle.com Signed-off-by: Liam R. Howlett Reviewed-by: Laurent Dufour Acked-by: David Hildenbrand Acked-by: Davidlohr Bueso Cc: Geert Uytterhoeven Signed-off-by: Andrew Morton --- mm/mremap.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/mm/mremap.c~mm-mremap-use-vma_lookup-in-vma_to_resize +++ a/mm/mremap.c @@ -634,10 +634,11 @@ static struct vm_area_struct *vma_to_res unsigned long *p) { struct mm_struct *mm = current->mm; - struct vm_area_struct *vma = find_vma(mm, addr); + struct vm_area_struct *vma; unsigned long pgoff; - if (!vma || vma->vm_start > addr) + vma = vma_lookup(mm, addr); + if (!vma) return ERR_PTR(-EFAULT); /*