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authorDavid Howells <dhowells@redhat.com>2020-10-15 15:59:36 +0100
committerDavid Howells <dhowells@redhat.com>2020-11-23 18:09:30 +0000
commit9a0e6464f45b056163e6f04b14df44b15f02ed3a (patch)
tree7f1a9cdcfa75a4128d3d03be9566711b751a63c8 /net/rxrpc/key.c
parent4c20c33340269e2924d2040a5f1ca2571fd8b258 (diff)
downloadlinux-9a0e6464f45b056163e6f04b14df44b15f02ed3a.tar.bz2
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/key.c')
-rw-r--r--net/rxrpc/key.c31
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;
}
/*