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| author |   David Howells <dhowells@redhat.com> | 2020-10-15 15:59:36 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2020-11-23 18:09:30 +0000 |
| commit | 9a0e6464f45b056163e6f04b14df44b15f02ed3a (patch) | |
| tree | 7f1a9cdcfa75a4128d3d03be9566711b751a63c8 /net/rxrpc | |
| parent | rxrpc: Make the parsing of xdr payloads more coherent (diff) | |
| download | linux-dev-9a0e6464f45b056163e6f04b14df44b15f02ed3a.tar.xz linux-dev-9a0e6464f45b056163e6f04b14df44b15f02ed3a.zip | |
rxrpc: Ignore unknown tokens in key payload unless no known tokens
When parsing a payload for an rxrpc-type key, ignore any tokens that are
not of a known type and don't give an error for them - unless there are no
tokens of a known type.
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc')
| -rw-r--r-- | net/rxrpc/key.c | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c index a9d8f5b466be..7e6d19263ce3 100644 --- a/net/rxrpc/key.c +++ b/net/rxrpc/key.c @@ -139,7 +139,7 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) const char *cp; unsigned int len, paddedlen, loop, ntoken, toklen, sec_ix; size_t datalen = prep->datalen; - int ret; + int ret, ret2; _enter(",{%x,%x,%x,%x},%zu", ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]), @@ -213,6 +213,7 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) /* okay: we're going to assume it's valid XDR format * - we ignore the cellname, relying on the key to be correctly named */ + ret = -EPROTONOSUPPORT; do { toklen = ntohl(*xdr++); token = xdr; @@ -225,27 +226,37 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) switch (sec_ix) { case RXRPC_SECURITY_RXKAD: - ret = rxrpc_preparse_xdr_rxkad(prep, datalen, token, toklen); - if (ret != 0) - goto error; + ret2 = rxrpc_preparse_xdr_rxkad(prep, datalen, token, toklen); + break; + default: + ret2 = -EPROTONOSUPPORT; break; + } + switch (ret2) { + case 0: + ret = 0; + break; + case -EPROTONOSUPPORT: + break; + case -ENOPKG: + if (ret != 0) + ret = -ENOPKG; + break; default: - ret = -EPROTONOSUPPORT; + ret = ret2; goto error; } } while (--ntoken > 0); - _leave(" = 0"); - return 0; +error: + _leave(" = %d", ret); + return ret; not_xdr: _leave(" = -EPROTO"); return -EPROTO; -error: - _leave(" = %d", ret); - return ret; } /* |