diff options
author | Mark Michelson <mmichelson@digium.com> | 2014-12-08 16:41:45 +0000 |
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committer | Mark Michelson <mmichelson@digium.com> | 2014-12-08 16:41:45 +0000 |
commit | 1712694817cfa4cfdf9cbf5dedf679b9e56140a9 (patch) | |
tree | 4278187b8894432b6002912d2a8074c94bd22c46 | |
parent | 93b1df3bf6c6832053fc7444cd07640c273cb1df (diff) |
Fix a crash that would occur when receiving a 491 response to a reinvite.
The reviewboard description does a fine job of summarizing this, so here it is:
A reporter discovered that Asterisk would crash when attempting to retransmit
a reinvite that had previously received a 491 response. The crash occurred
because a pjsip_tx_data structure was being saved for reuse, but its reference
count was not being increased. The result was that the pjsip_tx_data was being
freed before we were actually done with it. When we attempted to re-use the
structure when re-sending the reinvite, Asterisk would crash.
The fix implemented here is not to try holding onto the pjsip_tx_data at all.
Instead, when we reschedule sending the reinvite, we create a brand new
pjsip_tx_data and send that instead. Because of this change, there is no need
for an ast_sip_session_delayed_request structure to have a pjsip_tx_data on
it any more. So any code referencing its use has been removed.
When this initial fix was introduced, I encountered a second crash when
processing a subsequent 200 OK on a rescheduled reinvite. The reason was
that when rescheduling the reinvite, we gave the wrong location for a
response callback. This has been fixed in this patch as well.
ASTERISK-24556 #close
Reported by Abhay Gupta
Review: https://reviewboard.asterisk.org/r/4233
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@429089 65c4cc65-6c06-0410-ace0-fbb531ad65f3
-rw-r--r-- | res/res_pjsip_session.c | 31 |
1 files changed, 11 insertions, 20 deletions
diff --git a/res/res_pjsip_session.c b/res/res_pjsip_session.c index 85c4b6121..f33732512 100644 --- a/res/res_pjsip_session.c +++ b/res/res_pjsip_session.c @@ -497,8 +497,6 @@ struct ast_sip_session_delayed_request { ast_sip_session_response_cb on_response; /*! Whether to generate new SDP */ int generate_new_sdp; - /*! Request to send */ - pjsip_tx_data *tdata; AST_LIST_ENTRY(ast_sip_session_delayed_request) next; }; @@ -506,8 +504,7 @@ static struct ast_sip_session_delayed_request *delayed_request_alloc(const char ast_sip_session_request_creation_cb on_request_creation, ast_sip_session_sdp_creation_cb on_sdp_creation, ast_sip_session_response_cb on_response, - int generate_new_sdp, - pjsip_tx_data *tdata) + int generate_new_sdp) { struct ast_sip_session_delayed_request *delay = ast_calloc(1, sizeof(*delay)); if (!delay) { @@ -518,7 +515,6 @@ static struct ast_sip_session_delayed_request *delayed_request_alloc(const char delay->on_sdp_creation = on_sdp_creation; delay->on_response = on_response; delay->generate_new_sdp = generate_new_sdp; - delay->tdata = tdata; return delay; } @@ -526,11 +522,6 @@ static int send_delayed_request(struct ast_sip_session *session, struct ast_sip_ { ast_debug(3, "Sending delayed %s request to %s\n", delay->method, ast_sorcery_object_get_id(session->endpoint)); - if (delay->tdata) { - ast_sip_session_send_request_with_cb(session, delay->tdata, delay->on_response); - return 0; - } - if (!strcmp(delay->method, "INVITE")) { ast_sip_session_refresh(session, delay->on_request_creation, delay->on_sdp_creation, delay->on_response, AST_SIP_SESSION_REFRESH_METHOD_INVITE, delay->generate_new_sdp); @@ -573,10 +564,10 @@ static void queue_delayed_request(struct ast_sip_session *session) static int delay_request(struct ast_sip_session *session, ast_sip_session_request_creation_cb on_request, ast_sip_session_sdp_creation_cb on_sdp_creation, ast_sip_session_response_cb on_response, - int generate_new_sdp, const char *method, pjsip_tx_data *tdata) + int generate_new_sdp, const char *method) { struct ast_sip_session_delayed_request *delay = delayed_request_alloc(method, - on_request, on_sdp_creation, on_response, generate_new_sdp, tdata); + on_request, on_sdp_creation, on_response, generate_new_sdp); if (!delay) { return -1; @@ -621,7 +612,7 @@ int ast_sip_session_refresh(struct ast_sip_session *session, ast_debug(3, "Delaying sending request to %s because dialog has not been established...\n", ast_sorcery_object_get_id(session->endpoint)); return delay_request(session, on_request_creation, on_sdp_creation, on_response, generate_new_sdp, - method == AST_SIP_SESSION_REFRESH_METHOD_INVITE ? "INVITE" : "UPDATE", NULL); + method == AST_SIP_SESSION_REFRESH_METHOD_INVITE ? "INVITE" : "UPDATE"); } if (method == AST_SIP_SESSION_REFRESH_METHOD_INVITE) { @@ -630,7 +621,7 @@ int ast_sip_session_refresh(struct ast_sip_session *session, ast_debug(3, "Delaying sending reinvite to %s because of outstanding transaction...\n", ast_sorcery_object_get_id(session->endpoint)); return delay_request(session, on_request_creation, on_sdp_creation, on_response, - generate_new_sdp, "INVITE", NULL); + generate_new_sdp, "INVITE"); } else if (inv_session->state != PJSIP_INV_STATE_CONFIRMED) { /* Initial INVITE transaction failed to progress us to a confirmed state * which means re-invites are not possible @@ -647,7 +638,7 @@ int ast_sip_session_refresh(struct ast_sip_session *session, ast_debug(3, "Delaying session refresh with new SDP to %s because SDP negotiation is not yet done...\n", ast_sorcery_object_get_id(session->endpoint)); return delay_request(session, on_request_creation, on_sdp_creation, on_response, generate_new_sdp, - method == AST_SIP_SESSION_REFRESH_METHOD_INVITE ? "INVITE" : "UPDATE", NULL); + method == AST_SIP_SESSION_REFRESH_METHOD_INVITE ? "INVITE" : "UPDATE"); } new_sdp = generate_session_refresh_sdp(session); @@ -1728,10 +1719,10 @@ static void resend_reinvite(pj_timer_heap_t *timer, pj_timer_entry *entry) ast_sip_push_task(rrd->session->serializer, really_resend_reinvite, entry->user_data); } -static void reschedule_reinvite(struct ast_sip_session *session, ast_sip_session_response_cb on_response, pjsip_tx_data *tdata) +static void reschedule_reinvite(struct ast_sip_session *session, ast_sip_session_response_cb on_response) { struct ast_sip_session_delayed_request *delay = delayed_request_alloc("INVITE", - NULL, NULL, on_response, 1, tdata); + NULL, NULL, on_response, 1); pjsip_inv_session *inv = session->inv_session; struct reschedule_reinvite_data *rrd = reschedule_reinvite_data_alloc(session, delay); pj_time_val tv; @@ -1981,6 +1972,7 @@ static void session_inv_on_tsx_state_changed(pjsip_inv_session *inv, pjsip_trans tsx->mod_data[session_module.id] = e->body.tsx_state.src.tdata->mod_data[session_module.id]; break; case PJSIP_EVENT_RX_MSG: + cb = ast_sip_mod_data_get(tsx->mod_data, session_module.id, MOD_DATA_ON_RESPONSE); handle_incoming(session, e->body.tsx_state.src.rdata, e->type, AST_SIP_SESSION_AFTER_MEDIA); if (tsx->method.id == PJSIP_INVITE_METHOD) { @@ -1988,7 +1980,7 @@ static void session_inv_on_tsx_state_changed(pjsip_inv_session *inv, pjsip_trans if (tsx->state == PJSIP_TSX_STATE_COMPLETED) { /* This means we got a non 2XX final response to our outgoing INVITE */ if (tsx->status_code == PJSIP_SC_REQUEST_PENDING) { - reschedule_reinvite(session, tsx->mod_data[session_module.id], tsx->last_tx); + reschedule_reinvite(session, cb); return; } else if (inv->state == PJSIP_INV_STATE_CONFIRMED && tsx->status_code != 488) { @@ -2015,8 +2007,7 @@ static void session_inv_on_tsx_state_changed(pjsip_inv_session *inv, pjsip_trans } } } - if ((cb = ast_sip_mod_data_get(tsx->mod_data, session_module.id, - MOD_DATA_ON_RESPONSE))) { + if (cb) { cb(session, e->body.tsx_state.src.rdata); } case PJSIP_EVENT_TRANSPORT_ERROR: |