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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH net-next 22/23] 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: Thu, 01 Oct 2020 15:59:17 +0100 Message-ID: <160156435708.1728886.15158099093775622006.stgit@warthog.procyon.org.uk> In-Reply-To: <160156420377.1728886.5309670328610130816.stgit@warthog.procyon.org.uk> References: <160156420377.1728886.5309670328610130816.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c index c08827b87979..19b730b58516 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, *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); @@ -214,13 +214,11 @@ 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++); 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: @@ -234,6 +232,8 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) goto error; } + xdr += (toklen + 3) / 4; + } while (--ntoken > 0); _leave(" = 0");