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Nullify on_circuit if last conflux leg

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Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2023-07-31 10:57:34 -04:00 committed by Mike Perry
parent 4667195ded
commit 5487476fd9
1 changed files with 44 additions and 0 deletions
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44
src/core/or/conflux_pool.c
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@ -1509,6 +1509,49 @@ linked_update_stream_backpointers(circuit_t *circ)
}
}
/** This is called when this circuit is the last leg.
*
* The "on_circuit" pointer is nullified here so it is not given back to the
* conflux subsytem between the circuit mark for close step and actually
* freeing the circuit which is when streams are destroyed.
*
* Reason is that when the connection edge inbuf is packaged in
* connection_edge_package_raw_inbuf(), the on_circuit pointer is used and
* then passed on to conflux to learn which leg to use. However, if the circuit
* was marked prior but not yet freed, there are no more legs remaining which
* leads to a linked circuit being used without legs. No bueno. */
static void
linked_detach_circuit(circuit_t *circ)
{
tor_assert(circ);
tor_assert_nonfatal(circ->conflux);
if (CIRCUIT_IS_ORIGIN(circ)) {
origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
tor_assert_nonfatal(circ->purpose == CIRCUIT_PURPOSE_CONFLUX_LINKED);
/* Iterate over stream list using next_stream pointer, until null */
for (edge_connection_t *stream = ocirc->p_streams; stream;
stream = stream->next_stream) {
/* Update the circuit pointer of each stream */
stream->on_circuit = NULL;
}
} else {
or_circuit_t *orcirc = TO_OR_CIRCUIT(circ);
/* Iterate over stream list using next_stream pointer, until null */
for (edge_connection_t *stream = orcirc->n_streams; stream;
stream = stream->next_stream) {
/* Update the circuit pointer of each stream */
stream->on_circuit = NULL;
}
/* Iterate over stream list using next_stream pointer, until null */
for (edge_connection_t *stream = orcirc->resolving_streams; stream;
stream = stream->next_stream) {
/* Update the circuit pointer of each stream */
stream->on_circuit = NULL;
}
}
}
/** Nullify all streams of the given circuit. */
static void
linked_nullify_streams(circuit_t *circ)
@ -1549,6 +1592,7 @@ linked_circuit_closed(circuit_t *circ)
if (CONFLUX_NUM_LEGS(circ->conflux) == 0) {
/* Last leg, remove conflux object from linked set. */
linked_pool_del(circ->conflux->nonce, is_client);
linked_detach_circuit(circ);
} else {
/* If there are other circuits, update streams backpointers and
* nullify the stream lists. We do not free those streams in circuit_free_.