Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933195Ab2EUSX5 (ORCPT ); Mon, 21 May 2012 14:23:57 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:58257 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758074Ab2EUSX4 (ORCPT ); Mon, 21 May 2012 14:23:56 -0400 Message-ID: <4FBA8829.3010800@jp.fujitsu.com> Date: Mon, 21 May 2012 14:23:37 -0400 From: KOSAKI Motohiro User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: dave@linux.vnet.ibm.com CC: cl@linux.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, aarcange@redhat.com, kosaki.motohiro@jp.fujitsu.com, hughd@google.com, rientjes@google.com, adobriyan@gmail.com, akpm@linux-foundation.org, mel@csn.ul.ie Subject: Re: [RFC][PATCH] hugetlb: fix resv_map leak in error path References: <20120518184630.FF3307BD@kernel> In-Reply-To: <20120518184630.FF3307BD@kernel> Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1203 Lines: 32 On 5/18/2012 2:46 PM, Dave Hansen wrote: > When called for anonymous (non-shared) mappings, > hugetlb_reserve_pages() does a resv_map_alloc(). It depends on > code in hugetlbfs's vm_ops->close() to release that allocation. > > However, in the mmap() failure path, we do a plain unmap_region() > without the remove_vma() which actually calls vm_ops->close(). > > This is a decent fix. This leak could get reintroduced if > new code (say, after hugetlb_reserve_pages() in > hugetlbfs_file_mmap()) decides to return an error. But, I think > it would have to unroll the reservation anyway. > > This hasn't been extensively tested. Pretty much compile and > boot tested along with Christoph's test case. > > Comments? > > > Signed-off-by: Dave Hansen > --- I don't think this is cleaner fix. but I also think we should fix the leak asap. so Let's simple fix first. Acked-by: KOSAKI Motohiro -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/