From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1162387Ab2GLWt0 (ORCPT ); Thu, 12 Jul 2012 18:49:26 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:54985 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1162344Ab2GLWpw (ORCPT ); Thu, 12 Jul 2012 18:45:52 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg KH , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Hugh Dickins , Miklos Szeredi , Badari Pulavarty , Nick Piggin , Andy Lutomirski , Ben Hutchings Subject: [ 177/187] mm: Hold a file reference in madvise_remove Date: Thu, 12 Jul 2012 15:35:33 -0700 Message-Id: <20120712191539.703286827@linuxfoundation.org> X-Mailer: git-send-email 1.7.10.1.362.g242cab3 In-Reply-To: <20120712191522.742634173@linuxfoundation.org> References: <20120712192421.GA28926@kroah.com> <20120712191522.742634173@linuxfoundation.org> User-Agent: quilt/0.60-20.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Greg KH 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andy Lutomirski commit 9ab4233dd08036fe34a89c7dc6f47a8bf2eb29eb upstream. Otherwise the code races with munmap (causing a use-after-free of the vma) or with close (causing a use-after-free of the struct file). The bug was introduced by commit 90ed52ebe481 ("[PATCH] holepunch: fix mmap_sem i_mutex deadlock")