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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18308C433F5 for ; Mon, 14 Feb 2022 09:50:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234721AbiBNJud (ORCPT ); Mon, 14 Feb 2022 04:50:33 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:44760 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245522AbiBNJp6 (ORCPT ); Mon, 14 Feb 2022 04:45:58 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5CE576A3BC; Mon, 14 Feb 2022 01:39:06 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id EA9476117D; Mon, 14 Feb 2022 09:39:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C10E5C340EF; Mon, 14 Feb 2022 09:39:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1644831545; bh=mYXwYZjv48YdTVJBj6NFznd2NYDFoaanaF1gYz+8OA8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RmnpgHh2coJI+m5itBYIzk/Yr0iEgLgNwcKo211iGsWhRao2KHkZ4hs4JfD9PtEG9 MiuQ0YHgBJsIVzm6xZ6L8YxPNrwguKBcKR+EWOx0Wv+oQs5sFDXSU/nyxSgFFkh96O Yi11AgZhTOiWLt5d69QnBN5sxxxAqnjO4zbnUCZA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, rtm@csail.mit.edu, Trond Myklebust , Anna Schumaker , Sasha Levin Subject: [PATCH 5.10 017/116] NFSv4.1: Fix uninitialised variable in devicenotify Date: Mon, 14 Feb 2022 10:25:16 +0100 Message-Id: <20220214092459.276752253@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220214092458.668376521@linuxfoundation.org> References: <20220214092458.668376521@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Trond Myklebust [ Upstream commit b05bf5c63b326ce1da84ef42498d8e0e292e694c ] When decode_devicenotify_args() exits with no entries, we need to ensure that the struct cb_devicenotifyargs is initialised to { 0, NULL } in order to avoid problems in nfs4_callback_devicenotify(). Reported-by: Signed-off-by: Trond Myklebust Signed-off-by: Anna Schumaker Signed-off-by: Sasha Levin --- fs/nfs/callback.h | 2 +- fs/nfs/callback_proc.c | 2 +- fs/nfs/callback_xdr.c | 18 +++++++++--------- 3 files changed, 11 insertions(+), 11 deletions(-) diff --git a/fs/nfs/callback.h b/fs/nfs/callback.h index 6a2033131c068..ccd4f245cae24 100644 --- a/fs/nfs/callback.h +++ b/fs/nfs/callback.h @@ -170,7 +170,7 @@ struct cb_devicenotifyitem { }; struct cb_devicenotifyargs { - int ndevs; + uint32_t ndevs; struct cb_devicenotifyitem *devs; }; diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c index be546ece383f5..b44219ce60b86 100644 --- a/fs/nfs/callback_proc.c +++ b/fs/nfs/callback_proc.c @@ -353,7 +353,7 @@ __be32 nfs4_callback_devicenotify(void *argp, void *resp, struct cb_process_state *cps) { struct cb_devicenotifyargs *args = argp; - int i; + uint32_t i; __be32 res = 0; struct nfs_client *clp = cps->clp; struct nfs_server *server = NULL; diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c index 79ff172eb1c81..1725079a05276 100644 --- a/fs/nfs/callback_xdr.c +++ b/fs/nfs/callback_xdr.c @@ -259,11 +259,9 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp, void *argp) { struct cb_devicenotifyargs *args = argp; + uint32_t tmp, n, i; __be32 *p; __be32 status = 0; - u32 tmp; - int n, i; - args->ndevs = 0; /* Num of device notifications */ p = xdr_inline_decode(xdr, sizeof(uint32_t)); @@ -272,7 +270,7 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp, goto out; } n = ntohl(*p++); - if (n <= 0) + if (n == 0) goto out; if (n > ULONG_MAX / sizeof(*args->devs)) { status = htonl(NFS4ERR_BADXDR); @@ -331,19 +329,21 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp, dev->cbd_immediate = 0; } - args->ndevs++; - dprintk("%s: type %d layout 0x%x immediate %d\n", __func__, dev->cbd_notify_type, dev->cbd_layout_type, dev->cbd_immediate); } + args->ndevs = n; + dprintk("%s: ndevs %d\n", __func__, args->ndevs); + return 0; +err: + kfree(args->devs); out: + args->devs = NULL; + args->ndevs = 0; dprintk("%s: status %d ndevs %d\n", __func__, ntohl(status), args->ndevs); return status; -err: - kfree(args->devs); - goto out; } static __be32 decode_sessionid(struct xdr_stream *xdr, -- 2.34.1