From patchwork Mon Nov 23 20:11:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 331952 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=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS 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 9581DC64EBC for ; Mon, 23 Nov 2020 20:11:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 35DEC20715 for ; Mon, 23 Nov 2020 20:11:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="VmQXdasN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732713AbgKWULX (ORCPT ); Mon, 23 Nov 2020 15:11:23 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:22574 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732692AbgKWULU (ORCPT ); Mon, 23 Nov 2020 15:11:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1606162279; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BucjfkTdsu/6qMhVKwCOxP6e6VVAYFVqDMnKbCaFjOI=; b=VmQXdasNQN8GZ3zZZUx4JI/GH+IJXY3yB2aQg3q253rJiiYQciTwaOpKMWBTmLW5Iqw4I/ YNetwlG+9q6gi1PIplqfaqPo2TS1VVDU8A90sf5GITFEqSGikLwRRKedBP4JT3gWwGShZh oAmpdheJAi0+jsa7x39wcigZKQNQ8+8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-165-Z2WovFMLOUCWd9d0-Shb0g-1; Mon, 23 Nov 2020 15:11:17 -0500 X-MC-Unique: Z2WovFMLOUCWd9d0-Shb0g-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id DC07B8030A5; Mon, 23 Nov 2020 20:11:15 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-112-111.rdu2.redhat.com [10.10.112.111]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1BEEF9CA0; Mon, 23 Nov 2020 20:11:14 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH net-next 10/17] rxrpc: Make the parsing of xdr payloads more coherent From: David Howells To: netdev@vger.kernel.org Cc: dhowells@redhat.com, linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org Date: Mon, 23 Nov 2020 20:11:14 +0000 Message-ID: <160616227430.830164.6815276950448082758.stgit@warthog.procyon.org.uk> In-Reply-To: <160616220405.830164.2239716599743995145.stgit@warthog.procyon.org.uk> References: <160616220405.830164.2239716599743995145.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Make the parsing of xdr-encoded payloads, as passed to add_key, more coherent. Shuttling back and forth between various variables was a bit hard to follow. Signed-off-by: David Howells --- net/rxrpc/key.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c index ed29ec01237b..a9d8f5b466be 100644 --- a/net/rxrpc/key.c +++ b/net/rxrpc/key.c @@ -135,7 +135,7 @@ static int rxrpc_preparse_xdr_rxkad(struct key_preparsed_payload *prep, */ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) { - const __be32 *xdr = prep->data, *token; + const __be32 *xdr = prep->data, *token, *p; const char *cp; unsigned int len, paddedlen, loop, ntoken, toklen, sec_ix; size_t datalen = prep->datalen; @@ -189,20 +189,20 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) goto not_xdr; /* check each token wrapper */ - token = xdr; + p = xdr; loop = ntoken; do { if (datalen < 8) goto not_xdr; - toklen = ntohl(*xdr++); - sec_ix = ntohl(*xdr); + toklen = ntohl(*p++); + sec_ix = ntohl(*p); datalen -= 4; _debug("token: [%x/%zx] %x", toklen, datalen, sec_ix); paddedlen = (toklen + 3) & ~3; if (toklen < 20 || toklen > datalen || paddedlen > datalen) goto not_xdr; datalen -= paddedlen; - xdr += paddedlen >> 2; + p += paddedlen >> 2; } while (--loop > 0); @@ -214,17 +214,18 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) * - we ignore the cellname, relying on the key to be correctly named */ do { - xdr = token; toklen = ntohl(*xdr++); - token = xdr + ((toklen + 3) >> 2); - sec_ix = ntohl(*xdr++); + token = xdr; + xdr += (toklen + 3) / 4; + + sec_ix = ntohl(*token++); toklen -= 4; - _debug("TOKEN type=%u [%p-%p]", sec_ix, xdr, token); + _debug("TOKEN type=%x len=%x", sec_ix, toklen); switch (sec_ix) { case RXRPC_SECURITY_RXKAD: - ret = rxrpc_preparse_xdr_rxkad(prep, datalen, xdr, toklen); + ret = rxrpc_preparse_xdr_rxkad(prep, datalen, token, toklen); if (ret != 0) goto error; break;