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rxrpc: Be more selective about the types of received packets we accept

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Currently, received RxRPC packets outside the range 1-13 are rejected.
There are, however, holes in the range that should also be rejected - plus
at least one type we don't yet support - so reject these also.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2016-03-04 15:56:06 +00:00
parent ee6fe085a9
commit 351c1e6486
2 changed files with 13 additions and 1 deletions
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3
net/rxrpc/ar-input.c
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@@ -728,7 +728,8 @@ void rxrpc_data_ready(struct sock *sk)
sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber);
if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) {
if (sp->hdr.type >= RXRPC_N_PACKET_TYPES ||
!((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) {
_proto("Rx Bad Packet Type %u", sp->hdr.type);
goto bad_message;
}