From bcd1979454cd14087394f0c0a983205f6fbfcaf4 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@meshlink.io>
Date: Fri, 4 Oct 2019 21:06:33 +0200
Subject: [PATCH] Fix memory leaks from timers.

---
 src/event.c    | 40 +++++++++++++++++++++++++++++-----------
 src/meshlink.c |  2 +-
 src/net.c      |  4 +++-
 src/protocol.c | 20 ++++++++++++++------
 4 files changed, 47 insertions(+), 19 deletions(-)

diff --git a/src/event.c b/src/event.c
index 245e39ec..f88112ff 100644
--- a/src/event.c
+++ b/src/event.c
@@ -129,6 +129,15 @@ void timeout_set(event_loop_t *loop, timeout_t *timeout, struct timeval *tv) {
 	if(!splay_insert_node(&loop->timeouts, &timeout->node)) {
 		abort();
 	}
+
+	loop->deletion = true;
+}
+
+static void timeout_disable(event_loop_t *loop, timeout_t *timeout) {
+	splay_unlink_node(&loop->timeouts, &timeout->node);
+	timeout->tv = (struct timeval) {
+		0, 0
+	};
 }
 
 void timeout_del(event_loop_t *loop, timeout_t *timeout) {
@@ -136,13 +145,12 @@ void timeout_del(event_loop_t *loop, timeout_t *timeout) {
 		return;
 	}
 
-	loop->deletion = true;
+	if(timerisset(&timeout->tv)) {
+		timeout_disable(loop, timeout);
+	}
 
-	splay_unlink_node(&loop->timeouts, &timeout->node);
-	timeout->cb = 0;
-	timeout->tv = (struct timeval) {
-		0, 0
-	};
+	timeout->cb = NULL;
+	loop->deletion = true;
 }
 
 static int signal_compare(const signal_t *a, const signal_t *b) {
@@ -173,6 +181,16 @@ static void pipe_init(event_loop_t *loop) {
 	}
 }
 
+static void pipe_exit(event_loop_t *loop) {
+	io_del(loop, &loop->signalio);
+
+	close(loop->pipefd[0]);
+	close(loop->pipefd[1]);
+
+	loop->pipefd[0] = -1;
+	loop->pipefd[1] = -1;
+}
+
 void signal_trigger(event_loop_t *loop, signal_t *sig) {
 	uint8_t signum = sig->signum;
 	write(loop->pipefd[1], &signum, 1);
@@ -207,6 +225,10 @@ void signal_del(event_loop_t *loop, signal_t *sig) {
 
 	splay_unlink_node(&loop->signals, &sig->node);
 	sig->cb = NULL;
+
+	if(!loop->signals.count && loop->pipefd[0] != -1) {
+		pipe_exit(loop);
+	}
 }
 
 void idle_set(event_loop_t *loop, idle_cb_t cb, void *data) {
@@ -218,7 +240,6 @@ bool event_loop_run(event_loop_t *loop, pthread_mutex_t *mutex) {
 	fd_set readable;
 	fd_set writable;
 
-
 	while(loop->running) {
 		gettimeofday(&loop->now, NULL);
 		struct timeval diff, it, *tv = NULL;
@@ -228,11 +249,8 @@ bool event_loop_run(event_loop_t *loop, pthread_mutex_t *mutex) {
 			timersub(&timeout->tv, &loop->now, &diff);
 
 			if(diff.tv_sec < 0) {
+				timeout_disable(loop, timeout);
 				timeout->cb(loop, timeout->data);
-
-				if(timercmp(&timeout->tv, &loop->now, <)) {
-					timeout_del(loop, timeout);
-				}
 			} else {
 				tv = &diff;
 				break;
diff --git a/src/meshlink.c b/src/meshlink.c
index bee8eee3..a9988855 100644
--- a/src/meshlink.c
+++ b/src/meshlink.c
@@ -3512,7 +3512,7 @@ void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devcla
 void handle_network_change(meshlink_handle_t *mesh, bool online) {
 	(void)online;
 
-	if(!mesh->connections) {
+	if(!mesh->connections || !mesh->loop.running) {
 		return;
 	}
 
diff --git a/src/net.c b/src/net.c
index 9dd42dd5..c7c6723c 100644
--- a/src/net.c
+++ b/src/net.c
@@ -706,15 +706,17 @@ int main_loop(meshlink_handle_t *mesh) {
 	mesh->datafromapp.signum = 0;
 	signal_add(&(mesh->loop), &(mesh->datafromapp), (signal_cb_t)meshlink_send_from_queue, mesh, mesh->datafromapp.signum);
 
-	if(!event_loop_run(&(mesh->loop), &(mesh->mesh_mutex))) {
+	if(!event_loop_run(&mesh->loop, &mesh->mesh_mutex)) {
 		logger(mesh, MESHLINK_ERROR, "Error while waiting for input: %s", strerror(errno));
 		abort();
+		signal_del(&mesh->loop, &mesh->datafromapp);
 		timeout_del(&mesh->loop, &mesh->periodictimer);
 		timeout_del(&mesh->loop, &mesh->pingtimer);
 
 		return 1;
 	}
 
+	signal_del(&mesh->loop, &mesh->datafromapp);
 	timeout_del(&mesh->loop, &mesh->periodictimer);
 	timeout_del(&mesh->loop, &mesh->pingtimer);
 
diff --git a/src/protocol.c b/src/protocol.c
index fd180f4f..92418f17 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -200,10 +200,11 @@ static void age_past_requests(event_loop_t *loop, void *data) {
 		logger(mesh, MESHLINK_DEBUG, "Aging past requests: deleted %d, left %d", deleted, left);
 	}
 
-	if(left)
+	if(left) {
 		timeout_set(&mesh->loop, &mesh->past_request_timeout, &(struct timeval) {
-		10, rand() % 100000
-	});
+			10, rand() % 100000
+		});
+	}
 }
 
 bool seen_request(meshlink_handle_t *mesh, const char *request) {
@@ -216,16 +217,23 @@ bool seen_request(meshlink_handle_t *mesh, const char *request) {
 		new = xmalloc(sizeof(*new));
 		new->request = xstrdup(request);
 		new->firstseen = mesh->loop.now.tv_sec;
+
+		if(!mesh->past_request_tree->head) {
+			timeout_set(&mesh->loop, &mesh->past_request_timeout, &(struct timeval) {
+				10, rand() % 100000
+			});
+		}
+
 		splay_insert(mesh->past_request_tree, new);
-		timeout_add(&mesh->loop, &mesh->past_request_timeout, age_past_requests, NULL, &(struct timeval) {
-			10, rand() % 100000
-		});
 		return false;
 	}
 }
 
 void init_requests(meshlink_handle_t *mesh) {
 	mesh->past_request_tree = splay_alloc_tree((splay_compare_t) past_request_compare, (splay_action_t) free_past_request);
+	timeout_add(&mesh->loop, &mesh->past_request_timeout, age_past_requests, NULL, &(struct timeval) {
+		0, 0
+	});
 }
 
 void exit_requests(meshlink_handle_t *mesh) {
-- 
2.39.2