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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 1167CC47253 for ; Fri, 1 May 2020 13:30:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D440C2166E for ; Fri, 1 May 2020 13:30:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588339800; bh=QpvCLsMVUmPNvhbcAdhLPAMk2bdjVhQBVqFvBHaLzLw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZY1w/TOf65eZdvQ+B1F7LjuDFuja30LeSfH7/+Zs/+BdfQMU1Sfh/1kIyVc7G+2PZ CirHQuhcRJtbFyloXV695dWxaCUVsrA5adqAzMapgcmOrIImRCFEb4bS1NR200TKUz nlG8PFf8LPMUCQ8Tt69M7Mu03d2pAu1wPVzr6hBE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729856AbgEAN37 (ORCPT ); Fri, 1 May 2020 09:29:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:53700 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729848AbgEAN3z (ORCPT ); Fri, 1 May 2020 09:29:55 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 140FA208DB; Fri, 1 May 2020 13:29:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588339795; bh=QpvCLsMVUmPNvhbcAdhLPAMk2bdjVhQBVqFvBHaLzLw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rnwx1B2AQlCbcy+p2IjfwpVPyUOhscy/nLu1rHaPcr4N+i784okClnVpoMVplWnFY Hfrzg2zpZUdTLoCG6GyoHU9VPO5mEdWuFh98tSW0NN/ENZ4aZyPedHGmqPgTSqrx0v O9QmJUnQvsw2I0jUw2tuBYDE7MotVSHQCAoavr98= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vasily Averin , Jeff Layton , Chuck Lever Subject: [PATCH 4.9 63/80] nfsd: memory corruption in nfsd4_lock() Date: Fri, 1 May 2020 15:21:57 +0200 Message-Id: <20200501131532.279438484@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200501131513.810761598@linuxfoundation.org> References: <20200501131513.810761598@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: Vasily Averin commit e1e8399eee72e9d5246d4d1bcacd793debe34dd3 upstream. New struct nfsd4_blocked_lock allocated in find_or_allocate_block() does not initialized nbl_list and nbl_lru. If conflock allocation fails rollback can call list_del_init() access uninitialized fields and corrupt memory. v2: just initialize nbl_list and nbl_lru right after nbl allocation. Fixes: 76d348fadff5 ("nfsd: have nfsd4_lock use blocking locks for v4.1+ lock") Signed-off-by: Vasily Averin Reviewed-by: Jeff Layton Signed-off-by: Chuck Lever Signed-off-by: Greg Kroah-Hartman --- fs/nfsd/nfs4state.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -246,6 +246,8 @@ find_or_allocate_block(struct nfs4_locko if (!nbl) { nbl= kmalloc(sizeof(*nbl), GFP_KERNEL); if (nbl) { + INIT_LIST_HEAD(&nbl->nbl_list); + INIT_LIST_HEAD(&nbl->nbl_lru); fh_copy_shallow(&nbl->nbl_fh, fh); locks_init_lock(&nbl->nbl_lock); nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,