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=-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=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 CC670C11F64 for ; Tue, 29 Jun 2021 02:39:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B78BA61D0D for ; Tue, 29 Jun 2021 02:39:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231706AbhF2CmP (ORCPT ); Mon, 28 Jun 2021 22:42:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:34636 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231348AbhF2CmP (ORCPT ); Mon, 28 Jun 2021 22:42:15 -0400 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 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org 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); /* _