Commit aad58547 authored Apr 26, 2012 by Allan Stephens Committed by Paul Gortmaker Apr 27, 2012

tipc: Reject payload messages with invalid message type



Adds check to ensure TIPC sockets reject incoming payload messages
that have an unrecognized message type.

Remove the old open question about whether TIPC_ERR_NO_PORT is
the proper return value.  It is appropriate here since there are
valid instances where another node can make use of the reply,
and at this point in time the host is already broadcasting TIPC
data, so there are no real security concerns.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

parent 8f177896

net/tipc/socket.c

+2 −5

Original line number	Diff line number	Diff line
		@@ -1223,11 +1223,8 @@ static u32 filter_rcv(struct sock sk, struct sk_buff buf)

		/* Reject message if it is wrong sort of message for socket */

		/*
		* WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD?
		* "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY
		* BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC
		*/
		if (msg_type(msg) > TIPC_DIRECT_MSG)
		return TIPC_ERR_NO_PORT;

		if (sock->state == SS_READY) {
		if (msg_connected(msg))