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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 E1254C433E9 for ; Mon, 18 Jan 2021 19:52:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B90CB22257 for ; Mon, 18 Jan 2021 19:52:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2437146AbhART0m (ORCPT ); Mon, 18 Jan 2021 14:26:42 -0500 Received: from mail.kernel.org ([198.145.29.99]:33366 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390401AbhARLhp (ORCPT ); Mon, 18 Jan 2021 06:37:45 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3DE9822AB0; Mon, 18 Jan 2021 11:36:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1610969795; bh=Guk+tDRocdXKoGM5SsT7ipzRXI/FFxIVhCa+YVQQgm0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kq0jtIl25IB6SCGemH106OTohIrI7KHyaii0oISzmZklCKKcsYEhYrlyeTGFvgKts U11hSHjkkEZq1Sq+1cDESJhCjjkwIXZR05nkSIe4fPzuktc+ODcqT6MchwXD0CBI45 jHaOqjwVnZTqA2F5S7/SUSH5b0YwpR/cC/mhrX9s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Wysochanski , Trond Myklebust Subject: [PATCH 4.19 29/43] NFS4: Fix use-after-free in trace_event_raw_event_nfs4_set_lock Date: Mon, 18 Jan 2021 12:34:52 +0100 Message-Id: <20210118113336.354763875@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210118113334.966227881@linuxfoundation.org> References: <20210118113334.966227881@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: stable@vger.kernel.org From: Dave Wysochanski commit 3d1a90ab0ed93362ec8ac85cf291243c87260c21 upstream. It is only safe to call the tracepoint before rpc_put_task() because 'data' is freed inside nfs4_lock_release (rpc_release). Fixes: 48c9579a1afe ("Adding stateid information to tracepoints") Signed-off-by: Dave Wysochanski Signed-off-by: Trond Myklebust Signed-off-by: Greg Kroah-Hartman --- fs/nfs/nfs4proc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -6721,9 +6721,9 @@ static int _nfs4_do_setlk(struct nfs4_st data->arg.new_lock_owner, ret); } else data->cancelled = true; + trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); rpc_put_task(task); dprintk("%s: done, ret = %d!\n", __func__, ret); - trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); return ret; }