Audit improper usage of scheduler exposed by 5c713fdf18f.

channels/chan_iax2.c:
* Initialize struct chan_iax2_pvt scheduler ids earlier because of
iax2_destroy_helper().

channels/chan_sip.c:
channels/sip/config_parser.c:
* Fix initialization of scheduler id struct members.  Some off nominal
paths had 0 as a scheduler id to be destroyed when it was never started.

chan_skinny.c:
* Fix some scheduler id comparisons that excluded the valid 0 id.

channel.c:
* Fix channel initialization of the video stream scheduler id.

pbx_dundi.c:
* Fix channel initialization of the packet retransmission scheduler id.

ASTERISK-25476

Change-Id: I07a3449f728f671d326a22fcbd071f150ba2e8c8

4 files changed, 24 insertions, 14 deletions

diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index 42ccbd5fd..af44de96c 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -2236,6 +2236,14 @@ static struct chan_iax2_pvt *new_iax(struct ast_sockaddr *addr, const char *host
 		return NULL;
 	}
 
+	tmp->pingid = -1;
+	tmp->lagid = -1;
+	tmp->autoid = -1;
+	tmp->authid = -1;
+	tmp->initid = -1;
+	tmp->keyrotateid = -1;
+	tmp->jbid = -1;
+
 	if (ast_string_field_init(tmp, 32)) {
 		ao2_ref(tmp, -1);
 		tmp = NULL;
@@ -2243,18 +2251,11 @@ static struct chan_iax2_pvt *new_iax(struct ast_sockaddr *addr, const char *host
 	}
 
 	tmp->prefs = prefs_global;
-	tmp->pingid = -1;
-	tmp->lagid = -1;
-	tmp->autoid = -1;
-	tmp->authid = -1;
-	tmp->initid = -1;
-	tmp->keyrotateid = -1;
 
 	ast_string_field_set(tmp,exten, "s");
 	ast_string_field_set(tmp,host, host);
 
 	tmp->jb = jb_new();
-	tmp->jbid = -1;
 	jbconf.max_jitterbuf = maxjitterbuffer;
 	jbconf.resync_threshold = resyncthreshold;
 	jbconf.max_contig_interp = maxjitterinterps;
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 158dc7b18..6cfb59879 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -1709,6 +1709,7 @@ static int publish_expire(const void *data)
 	ast_assert(esc != NULL);
 
 	ao2_unlink(esc->compositor, esc_entry);
+	esc_entry->sched_id = -1;
 	ao2_ref(esc_entry, -1);
 	return 0;
 }
@@ -1741,6 +1742,11 @@ static struct sip_esc_entry *create_esc_entry(struct event_state_compositor *esc
 	/* Bump refcount for scheduler */
 	ao2_ref(esc_entry, +1);
 	esc_entry->sched_id = ast_sched_add(sched, expires_ms, publish_expire, esc_entry);
+	if (esc_entry->sched_id == -1) {
+		ao2_ref(esc_entry, -1);
+		ao2_ref(esc_entry, -1);
+		return NULL;
+	}
 
 	/* Note: This links the esc_entry into the ESC properly */
 	create_new_sip_etag(esc_entry, 0);
diff --git a/channels/chan_skinny.c b/channels/chan_skinny.c
index 6f56f732e..707ab02c5 100644
--- a/channels/chan_skinny.c
+++ b/channels/chan_skinny.c
@@ -5548,12 +5548,12 @@ static void setsubstate(struct skinny_subchannel *sub, int state)
 
 	skinny_locksub(sub);
 
-	if (sub->dialer_sched) {
+	if (-1 < sub->dialer_sched) {
 		skinny_sched_del(sub->dialer_sched, sub);
 		sub->dialer_sched = -1;
 	}
 
-	if (state != SUBSTATE_RINGIN && sub->aa_sched) {
+	if (state != SUBSTATE_RINGIN && -1 < sub->aa_sched) {
 		skinny_sched_del(sub->aa_sched, sub);
 		sub->aa_sched = -1;
 		sub->aa_beep = 0;
@@ -6238,7 +6238,7 @@ static int handle_keypad_button_message(struct skinny_req *req, struct skinnyses
 	}
 
 	if ((sub->owner && ast_channel_state(sub->owner) <  AST_STATE_UP)) {
-		if (sub->dialer_sched && !skinny_sched_del(sub->dialer_sched, sub)) {
+		if (-1 < sub->dialer_sched && !skinny_sched_del(sub->dialer_sched, sub)) {
 			SKINNY_DEBUG(DEBUG_SUB, 3, "Sub %u - Got a digit and not timed out, so try dialing\n", sub->callid);
 			sub->dialer_sched = -1;
 			len = strlen(sub->exten);
@@ -7075,7 +7075,7 @@ static int handle_soft_key_event_message(struct skinny_req *req, struct skinnyse
 	case SOFTKEY_BKSPC:
 		SKINNY_DEBUG(DEBUG_PACKET, 3, "Received SOFTKEY_BKSPC from %s, inst %d, callref %d\n",
 			d->name, instance, callreference);
-		if (sub->dialer_sched && !skinny_sched_del(sub->dialer_sched, sub)) {
+		if (-1 < sub->dialer_sched && !skinny_sched_del(sub->dialer_sched, sub)) {
 			size_t len;
 			sub->dialer_sched = -1;
 			len = strlen(sub->exten);
diff --git a/channels/sip/config_parser.c b/channels/sip/config_parser.c
index a3964b047..56d04b260 100644
--- a/channels/sip/config_parser.c
+++ b/channels/sip/config_parser.c
@@ -79,13 +79,17 @@ int sip_parse_register_line(struct sip_registry *reg, int default_expiry, const
 		AST_APP_ARG(port);
 	);
 
-	if (!value) {
+	if (!reg) {
 		return -1;
 	}
 
-	if (!reg) {
+	reg->expire = -1;
+	reg->timeout = -1;
+
+	if (!value) {
 		return -1;
 	}
+
 	ast_copy_string(buf, value, sizeof(buf));
 
 	/*! register => [peer?][transport://]user[@domain][:secret[:authuser]]@host[:port][/extension][~expiry]
@@ -261,7 +265,6 @@ int sip_parse_register_line(struct sip_registry *reg, int default_expiry, const
 	ast_string_field_set(reg, regdomain, ast_strip_quoted(S_OR(user2.domain, ""), "\"", "\""));
 
 	reg->transport = transport;
-	reg->timeout = reg->expire = -1;
 	reg->portno = portnum;
 	reg->regdomainport = domainport;
 	reg->callid_valid = FALSE;