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rxrpc: Don't treat call aborts as conn aborts

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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: 18bfeba50dfd ("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>
This commit is contained in:
David Howells 2018-03-30 21:04:44 +01:00
parent 03877bf6a3
commit 57b0c9d49b
1 changed files with 11 additions and 8 deletions
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19
net/rxrpc/input.c
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@ -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 (rxrpc_conn_is_service(conn) &&
(chan->last_type == RXRPC_PACKET_TYPE_ACK ||
sp->hdr.type == RXRPC_PACKET_TYPE_ABORT))
if (chan->call ||
sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)
goto discard_unlock;
/* But otherwise we need to retransmit the final packet from
* data cached in the connection record.
/* 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)
goto discard_unlock;
/* 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;