renepay: fix some memory leaks

plugins/renepay/main.c

@@ -29,10 +29,10 @@ struct pay_plugin *pay_plugin;
 static void memleak_mark(struct plugin *p, struct htable *memtable)
 {
 	memleak_scan_obj(memtable, pay_plugin);
-
-	// TODO is this necessary?
-	// memleak_scan_htable(memtable, &pay_plugin->chan_extra_map->raw);
-	// memleak_scan_htable(memtable, &pay_plugin->payment_map->raw);
+	memleak_scan_htable(memtable,
+			    &pay_plugin->uncertainty->chan_extra_map->raw);
+	memleak_scan_htable(memtable, &pay_plugin->payment_map->raw);
+	memleak_scan_htable(memtable, &pay_plugin->route_map->raw);
 }
 
 static const char *init(struct plugin *p,

plugins/renepay/mods.c

@@ -335,6 +335,7 @@ static struct command_result *selfpay_success(struct command *cmd,
 					      const jsmntok_t *tok,
 					      struct route *route)
 {
+	tal_steal(tmpctx, route); // discard this route when tmpctx clears
 	struct payment *payment =
 		    payment_map_get(pay_plugin->payment_map, route->key.payment_hash);
 	assert(payment);
@@ -357,6 +358,7 @@ static struct command_result *selfpay_failure(struct command *cmd,
 					      const jsmntok_t *tok,
 					      struct route *route)
 {
+	tal_steal(tmpctx, route); // discard this route when tmpctx clears
 	struct payment *payment =
 		    payment_map_get(pay_plugin->payment_map, route->key.payment_hash);
 	assert(payment);
@@ -382,6 +384,8 @@ static struct command_result *selfpay_cb(struct payment *payment)
 			   "Selfpay: cannot get a valid cmd.");
 
 	struct payment_info *pinfo = &payment->payment_info;
+	/* Self-payment routes are not part of the routetracker, we build them
+	 * on-the-fly here and release them on success or failure. */
 	struct route *route =
 	    new_route(payment, payment->groupid,
 		      /*partid=*/0, pinfo->payment_hash,
@@ -748,7 +752,7 @@ compute_routes_done(struct command *cmd UNUSED, const char *buf UNUSED,
 	// in the local gossmap.
 
 	enum jsonrpc_errcode errcode;
-	const char *err_msg;
+	const char *err_msg = NULL;
 
 	gossmap_apply_localmods(pay_plugin->gossmap, payment->local_gossmods);
 	// TODO: add an algorithm selector here
@@ -775,13 +779,17 @@ compute_routes_done(struct command *cmd UNUSED, const char *buf UNUSED,
 
 		&errcode,
 		&err_msg);
+	err_msg = tal_steal(tmpctx, err_msg);
 
 	gossmap_remove_localmods(pay_plugin->gossmap, payment->local_gossmods);
 
 	/* Couldn't feasible route, we stop. */
 	if (!payment->routes_computed) {
+		if(err_msg==NULL)
+			err_msg = tal_fmt(tmpctx, "get_routes returned NULL error message");
 		return payment_fail(payment, errcode, "%s", err_msg);
 	}
+
 	return payment_continue(payment);
 }
 

plugins/renepay/payment.c

@@ -280,7 +280,10 @@ struct command_result *payment_success(struct payment *payment,
 	assert(preimage);
 	payment->status = PAYMENT_SUCCESS;
 	payment->preimage = tal_free(payment->preimage);
-	payment->preimage = tal_dup(payment, struct preimage, preimage);
+	if(taken(preimage))
+		payment->preimage = tal_steal(payment, preimage);
+	else
+		payment->preimage = tal_dup(payment, struct preimage, preimage);
 	return payment_finish(payment);
 }
 

plugins/renepay/payment.h

@@ -27,7 +27,7 @@ struct payment {
 	enum payment_status status;
 
 	/* Payment preimage, in case of success. */
-	struct preimage *preimage;
+	const struct preimage *preimage;
 
 	/* Final error code and message, in case of failure. */
 	enum jsonrpc_errcode error_code;

plugins/renepay/routetracker.c

@@ -238,7 +238,7 @@ void payment_collect_results(struct payment *payment,
 		if (r->result->status == SENDPAY_COMPLETE && payment_preimage) {
 			assert(r->result->payment_preimage);
 			*payment_preimage =
-			    tal_dup(payment, struct preimage,
+			    tal_dup(tmpctx, struct preimage,
 				    r->result->payment_preimage);
 		}
 

plugins/renepay/uncertainty.c

@@ -89,6 +89,7 @@ int uncertainty_update(struct uncertainty *uncertainty, struct gossmap *gossmap)
 	}
 	for(size_t i=0;i<tal_count(del_list);i++) {
 		chan_extra_map_del(chan_extra_map, del_list[i]);
+		del_list[i] = tal_free(del_list[i]);
 	}
 	del_list = tal_free(del_list);