Commit 57b0c9d4 authored Mar 30, 2018 by David Howells

rxrpc: Don't treat call aborts as conn aborts

If a call-level abort is received for the previous call to complete on a
connection channel, then that abort is queued for the connection processor
to handle. Unfortunately, the connection processor then assumes without
checking that the abort is connection-level (ie. callNumber is 0) and
distributes it over all active calls on that connection, thereby
incorrectly aborting them.

Fix this by discarding aborts aimed at a completed call.

Further, discard all packets aimed at a call that's complete if there's
currently an active call on a channel, since the DATA packets associated
with the new call automatically terminate the old call.

Fixes: 18bfeba5 ("rxrpc: Perform terminal call ACK/ABORT retransmission from conn processor")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>

parent 03877bf6

net/rxrpc/input.c

+9 −6

Original line number	Diff line number	Diff line
		@@ -1242,16 +1242,19 @@ void rxrpc_data_ready(struct sock *udp_sk)
		goto discard_unlock;

		if (sp->hdr.callNumber == chan->last_call) {
		/* For the previous service call, if completed successfully, we
		* discard all further packets.
		if (chan->call \|\|
		sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)
		goto discard_unlock;

		/* For the previous service call, if completed
		* successfully, we discard all further packets.
		*/
		if (rxrpc_conn_is_service(conn) &&
		(chan->last_type == RXRPC_PACKET_TYPE_ACK \|\|
		sp->hdr.type == RXRPC_PACKET_TYPE_ABORT))
		chan->last_type == RXRPC_PACKET_TYPE_ACK)
		goto discard_unlock;

		/* But otherwise we need to retransmit the final packet from
		* data cached in the connection record.
		/* But otherwise we need to retransmit the final packet
		* from data cached in the connection record.
		*/
		rxrpc_post_packet_to_conn(conn, skb);
		goto out_unlock;