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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 0325CC3B189 for ; Thu, 13 Feb 2020 15:25:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CDA6E20848 for ; Thu, 13 Feb 2020 15:25:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581607547; bh=GWlmbiMV461p8XNCPKbPV1piO8V7/KlUIQoYLE7tbUU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=RZC1hV6mHoaHx+lOhsEJkFThMmQamqEcb6eucm1BKWFw7JQTgKS+dms6z6l5i8wQp uFLkaYaBwCpHDORRFpRLWLZicWWaNjrVlKvYvaYYmOjtVSAU16Hj43ANiqKsVmdRw4 6RlIs/PI9X8gZu16Tz94GbGhJahR0QHyMfT+sWJ4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728052AbgBMPZr (ORCPT ); Thu, 13 Feb 2020 10:25:47 -0500 Received: from mail.kernel.org ([198.145.29.99]:36650 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387401AbgBMPYF (ORCPT ); Thu, 13 Feb 2020 10:24:05 -0500 Received: from localhost (unknown [104.132.1.104]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 66F0B24690; Thu, 13 Feb 2020 15:24:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581607444; bh=GWlmbiMV461p8XNCPKbPV1piO8V7/KlUIQoYLE7tbUU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zQ/xyLZdNvypx+ZZ5zTdh3fOVg2+Ut1nxpX3gzLahJOr9BQPwSQ5u9Kgm8nLWpwAC 2il65/jGmmLjlinaiLQ3kYb7Bec1Ev0FPfQVLFi5OWaAqryvcgCZv/k0c0rDb0jJ8P AB7TmtW7xcPWTUCVKsNUUNlbcI4FpbfiTQ/+NZp8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Trond Myklebust , Benjamin Coddington , Anna Schumaker , Sasha Levin Subject: [PATCH 4.9 077/116] NFS: Fix memory leaks and corruption in readdir Date: Thu, 13 Feb 2020 07:20:21 -0800 Message-Id: <20200213151912.623470526@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200213151842.259660170@linuxfoundation.org> References: <20200213151842.259660170@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Trond Myklebust [ Upstream commit 4b310319c6a8ce708f1033d57145e2aa027a883c ] nfs_readdir_xdr_to_array() must not exit without having initialised the array, so that the page cache deletion routines can safely call nfs_readdir_clear_array(). Furthermore, we should ensure that if we exit nfs_readdir_filler() with an error, we free up any page contents to prevent a leak if we try to fill the page again. Fixes: 11de3b11e08c ("NFS: Fix a memory leak in nfs_readdir") Cc: stable@vger.kernel.org # v2.6.37+ Signed-off-by: Trond Myklebust Reviewed-by: Benjamin Coddington Signed-off-by: Anna Schumaker Signed-off-by: Sasha Levin --- fs/nfs/dir.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index a41df7d44bd7a..5936c54ac5fdb 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -169,6 +169,17 @@ typedef struct { unsigned int eof:1; } nfs_readdir_descriptor_t; +static +void nfs_readdir_init_array(struct page *page) +{ + struct nfs_cache_array *array; + + array = kmap_atomic(page); + memset(array, 0, sizeof(struct nfs_cache_array)); + array->eof_index = -1; + kunmap_atomic(array); +} + /* * The caller is responsible for calling nfs_readdir_release_array(page) */ @@ -202,6 +213,7 @@ void nfs_readdir_clear_array(struct page *page) array = kmap_atomic(page); for (i = 0; i < array->size; i++) kfree(array->array[i].string.name); + array->size = 0; kunmap_atomic(array); } @@ -643,6 +655,8 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, int status = -ENOMEM; unsigned int array_size = ARRAY_SIZE(pages); + nfs_readdir_init_array(page); + entry.prev_cookie = 0; entry.cookie = desc->last_cookie; entry.eof = 0; @@ -663,8 +677,8 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, status = PTR_ERR(array); goto out_label_free; } - memset(array, 0, sizeof(struct nfs_cache_array)); - array->eof_index = -1; + + array = kmap(page); status = nfs_readdir_alloc_pages(pages, array_size); if (status < 0) @@ -719,6 +733,7 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) unlock_page(page); return 0; error: + nfs_readdir_clear_array(page); unlock_page(page); return ret; } -- 2.20.1