[Asterisk-code-review] res pjsip: Handle invocation of callback on outgoing request... (asterisk[certified/13.13])

[Joshua Colp]

Joshua Colp has uploaded a new change for review. ( https://gerrit.asterisk.org/4868 )

Change subject: res_pjsip: Handle invocation of callback on outgoing request when error occurs.
......................................................................

res_pjsip: Handle invocation of callback on outgoing request when error occurs.

There are some error cases in PJSIP when sending a request that will
result in the callback for the request being invoked.  The code did not
handle this case and assumed on every error case that the callback was not
invoked.

The code has been changed to check whether the callback has been invoked
and if so to absorb the error and treat it as a success.

ASTERISK-26679
ASTERISK-26699

Change-Id: I563982ba204da5aa1428989a11c06dd9087fea91
---
M res/res_pjsip.c
1 file changed, 19 insertions(+), 6 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/68/4868/1

diff --git a/res/res_pjsip.c b/res/res_pjsip.c
index 0f13687..fde6479 100644
--- a/res/res_pjsip.c
+++ b/res/res_pjsip.c
@@ -3401,6 +3401,8 @@
 	void (*callback)(void *token, pjsip_event *e);
 	/*! Non-zero when the callback is called. */
 	unsigned int cb_called;
+	/*! Non-zero if endpt_send_request_cb() was called. */
+	unsigned int send_cb_called;
 	/*! Timeout timer. */
 	pj_timer_entry *timeout_timer;
 	/*! Original timeout. */
@@ -3417,6 +3419,12 @@
 {
 	struct send_request_wrapper *req_wrapper = token;
 	unsigned int cb_called;
+
+	/*
+	 * Needed because we cannot otherwise tell if this callback was
+	 * called when pjsip_endpt_send_request() returns error.
+	 */
+	req_wrapper->send_cb_called = 1;
 
 	if (e->body.tsx_state.type == PJSIP_EVENT_TIMER) {
 		ast_debug(2, "%p: PJSIP tsx timer expired\n", req_wrapper);
@@ -3601,12 +3609,10 @@
 	if (ret_val != PJ_SUCCESS) {
 		char errmsg[PJ_ERR_MSG_SIZE];
 
-		/*
-		 * endpt_send_request_cb is not expected to ever be called
-		 * because the request didn't get far enough to attempt
-		 * sending.
-		 */
-		ao2_ref(req_wrapper, -1);
+		if (!req_wrapper->send_cb_called) {
+			/* endpt_send_request_cb is not expected to ever be called now. */
+			ao2_ref(req_wrapper, -1);
+		}
 
 		/* Complain of failure to send the request. */
 		pj_strerror(ret_val, errmsg, sizeof(errmsg));
@@ -3643,6 +3649,13 @@
 				req_wrapper->cb_called = 1;
 			}
 			ao2_unlock(req_wrapper);
+		} else if (req_wrapper->cb_called) {
+			/*
+			 * We cannot report any error.  The callback has
+			 * already freed any resources associated with
+			 * token.
+			 */
+			ret_val = PJ_SUCCESS;
 		}
 	}
 

-- 
To view, visit https://gerrit.asterisk.org/4868
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I563982ba204da5aa1428989a11c06dd9087fea91
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: certified/13.13
Gerrit-Owner: Joshua Colp <jcolp at digium.com>