From patchwork Mon Jan 25 18:38:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 372462 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=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 08C03C433E0 for ; Tue, 26 Jan 2021 05:00:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C544222B51 for ; Tue, 26 Jan 2021 05:00:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730444AbhAZE7l (ORCPT ); Mon, 25 Jan 2021 23:59:41 -0500 Received: from mail.kernel.org ([198.145.29.99]:37792 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731104AbhAYSuu (ORCPT ); Mon, 25 Jan 2021 13:50:50 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 826E8207B3; Mon, 25 Jan 2021 18:49:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1611600597; bh=5jnrlHnylrYAHa/akBJ9ZvTWQzQ1pKGPovbDQaIXsEc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vXs4UgRZIse6ahGcpZ/5DeJepQ/gUk2HbV/SID/YNg+2r26rmsF02W67ALZb2o5aa NeNEYr9OlKzh6rW4TgLq0d26aY6G7794CvFDFwl+swZBZFYFPO3N4cfZqE1mo4c8w9 IsjuG3N/S6f1Q35oum5Djgu3eg61gvRyR8brIvh8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Trond Myklebust , Chuck Lever , Sasha Levin Subject: [PATCH 5.10 076/199] nfsd: Fixes for nfsd4_encode_read_plus_data() Date: Mon, 25 Jan 2021 19:38:18 +0100 Message-Id: <20210125183219.474286489@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210125183216.245315437@linuxfoundation.org> References: <20210125183216.245315437@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Trond Myklebust [ Upstream commit 72d78717c6d06adf65d2e3dccc96d9e9dc978593 ] Ensure that we encode the data payload + padding, and that we truncate the preallocated buffer to the actual read size. Fixes: 528b84934eb9 ("NFSD: Add READ_PLUS data support") Signed-off-by: Trond Myklebust Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- fs/nfsd/nfs4xdr.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 833a2c64dfe80..26f6e277101de 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -4632,6 +4632,7 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp, resp->rqstp->rq_vec, read->rd_vlen, maxcount, eof); if (nfserr) return nfserr; + xdr_truncate_encode(xdr, starting_len + 16 + xdr_align_size(*maxcount)); tmp = htonl(NFS4_CONTENT_DATA); write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4); @@ -4639,6 +4640,10 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp, write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp64, 8); tmp = htonl(*maxcount); write_bytes_to_xdr_buf(xdr->buf, starting_len + 12, &tmp, 4); + + tmp = xdr_zero; + write_bytes_to_xdr_buf(xdr->buf, starting_len + 16 + *maxcount, &tmp, + xdr_pad_size(*maxcount)); return nfs_ok; }