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res_pjsip: Prevent segfault in UDP registration with flow transports

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Segfault occurs during outbound UDP registration when all
transport states are being iterated over. The transport object
in the transport is accessed, but flow transports have a NULL
transport object.

Modify to not iterate over any flow transport

ASTERISK-29210 #close

Change-Id: If28dc3a18bdcbd0a49598b09b7fe4404d45c996a
This commit is contained in:
Nick French
2020-12-19 11:54:50 -06:00
committed by Friendly Automation
parent 3d379845e6
commit 3c8598ffef
1 changed files with 2 additions and 1 deletions
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3
res/res_pjsip/pjsip_message_filter.c
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@@ -111,7 +111,8 @@ static pjsip_transport *get_udp_transport(pj_str_t *address, int port)
}
for (iter = ao2_iterator_init(transport_states, 0); (transport_state = ao2_iterator_next(&iter)); ao2_ref(transport_state, -1)) {
if (transport_state->type == AST_TRANSPORT_UDP &&
if (!transport_state->flow &&
transport_state->type == AST_TRANSPORT_UDP &&
!pj_strcmp(&transport_state->transport->local_name.host, address) &&
transport_state->transport->local_name.port == port) {
sip_transport = transport_state->transport;