[simfs] Prevent a crash in sim_fs_notify_file_watches. Fixes JB#38656

If no file watchers have ever been added, context->file_watches
is NULL and sim_fs_notify_file_watches() should take that into
account.

ofono/drivers/ril/ril_sim.c

@@ -1,7 +1,7 @@
 /*
  *  oFono - Open Source Telephony - RIL-based devices
  *
- *  Copyright (C) 2015-2016 Jolla Ltd.
+ *  Copyright (C) 2015-2017 Jolla Ltd.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
@@ -85,6 +85,7 @@ struct ril_sim {
 	ofono_sim_passwd_cb_t query_passwd_state_cb;
 	void *query_passwd_state_cb_data;
 	guint query_passwd_state_timeout_id;
+	gulong query_passwd_state_sim_status_refresh_id;
 };
 
 struct ril_sim_io_response {
@@ -691,6 +692,12 @@ static void ril_sim_finish_passwd_state_query(struct ril_sim *sd,
 		sd->query_passwd_state_timeout_id = 0;
 	}
 
+	if (sd->query_passwd_state_sim_status_refresh_id) {
+		ril_sim_card_remove_handler(sd->card,
+			sd->query_passwd_state_sim_status_refresh_id);
+		sd->query_passwd_state_sim_status_refresh_id = 0;
+	}
+
 	if (sd->query_passwd_state_cb) {
 		ofono_sim_passwd_cb_t cb = sd->query_passwd_state_cb;
 		void *data = sd->query_passwd_state_cb_data;
@@ -884,6 +891,15 @@ static void ril_sim_query_pin_retries(struct ofono_sim *sim,
 	cb(ril_error_ok(&error), sd->retries, data);
 }
 
+static void ril_sim_query_passwd_state_complete_cb(struct ril_sim_card *sc,
+							void *user_data)
+{
+	struct ril_sim *sd = user_data;
+
+	GASSERT(sd->query_passwd_state_sim_status_refresh_id);
+	ril_sim_finish_passwd_state_query(sd, ril_sim_passwd_state(sd));
+}
+
 static gboolean ril_sim_query_passwd_state_timeout_cb(gpointer user_data)
 {
 	struct ril_sim *sd = user_data;
@@ -899,29 +915,41 @@ static void ril_sim_query_passwd_state(struct ofono_sim *sim,
 					ofono_sim_passwd_cb_t cb, void *data)
 {
 	struct ril_sim *sd = ril_sim_get_data(sim);
-	enum ofono_sim_password_type passwd_state = ril_sim_passwd_state(sd);
-	struct ofono_error error;
 
 	if (sd->query_passwd_state_timeout_id) {
 		g_source_remove(sd->query_passwd_state_timeout_id);
 		sd->query_passwd_state_timeout_id = 0;
 	}
 
-	if (passwd_state != OFONO_SIM_PASSWORD_INVALID) {
-		DBG_(sd, "%d", passwd_state);
-		sd->query_passwd_state_cb = NULL;
-		sd->query_passwd_state_cb_data = NULL;
-		sd->ofono_passwd_state = passwd_state;
-		cb(ril_error_ok(&error), passwd_state, data);
+	if (!sd->query_passwd_state_sim_status_refresh_id) {
+		ril_sim_card_remove_handler(sd->card,
+			sd->query_passwd_state_sim_status_refresh_id);
+		sd->query_passwd_state_sim_status_refresh_id = 0;
+	}
+
+	/* Always request fresh status, just in case. */
+	ril_sim_card_request_status(sd->card);
+	sd->query_passwd_state_cb = cb;
+	sd->query_passwd_state_cb_data = data;
+
+	if (ril_sim_passwd_state(sd) != OFONO_SIM_PASSWORD_INVALID) {
+		/* Just wait for GET_SIM_STATUS completion */
+		DBG_(sd, "waiting for SIM status query to complete");
+		sd->query_passwd_state_sim_status_refresh_id =
+			ril_sim_card_add_status_received_handler(sd->card,
+				ril_sim_query_passwd_state_complete_cb, sd);
 	} else {
 		/* Wait for the state to change */
 		DBG_(sd, "waiting for the SIM state to change");
-		sd->query_passwd_state_cb = cb;
-		sd->query_passwd_state_cb_data = data;
-		sd->query_passwd_state_timeout_id =
-			g_timeout_add_seconds(SIM_STATE_CHANGE_TIMEOUT_SECS,
-				ril_sim_query_passwd_state_timeout_cb, sd);
 	}
+
+	/*
+	 * We still need to complete the request somehow, even if
+	 * GET_STATUS never completes or SIM status never changes.
+	 */
+	sd->query_passwd_state_timeout_id =
+		g_timeout_add_seconds(SIM_STATE_CHANGE_TIMEOUT_SECS,
+			ril_sim_query_passwd_state_timeout_cb, sd);
 }
 
 static gboolean ril_sim_pin_change_state_timeout_cb(gpointer user_data)
@@ -1280,6 +1308,11 @@ static void ril_sim_remove(struct ofono_sim *sim)
 		g_source_remove(sd->query_passwd_state_timeout_id);
 	}
 
+	if (sd->query_passwd_state_sim_status_refresh_id) {
+		ril_sim_card_remove_handler(sd->card,
+			sd->query_passwd_state_sim_status_refresh_id);
+	}
+
 	ril_sim_card_remove_handler(sd->card, sd->card_status_id);
 	ril_sim_card_unref(sd->card);
 

ofono/drivers/ril/ril_sim_card.c

@@ -1,7 +1,7 @@
 /*
  *  oFono - Open Source Telephony - RIL-based devices
  *
- *  Copyright (C) 2015-2016 Jolla Ltd.
+ *  Copyright (C) 2015-2017 Jolla Ltd.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
@@ -64,8 +64,6 @@ G_DEFINE_TYPE(RilSimCard, ril_sim_card, G_TYPE_OBJECT)
 #define RIL_SIMCARD_STATE_CHANGED  (0x01)
 #define RIL_SIMCARD_STATUS_CHANGED (0x02)
 
-static void ril_sim_card_request_status(struct ril_sim_card *self);
-
 static gboolean ril_sim_card_app_equal(const struct ril_sim_card_app *a1,
 					const struct ril_sim_card_app *a2)
 {
@@ -365,7 +363,7 @@ static void ril_sim_card_status_cb(GRilIoChannel *io, int ril_status,
 	}
 }
 
-static void ril_sim_card_request_status(struct ril_sim_card *self)
+void ril_sim_card_request_status(struct ril_sim_card *self)
 {
 	struct ril_sim_card_priv *priv = self->priv;
 

ofono/drivers/ril/ril_sim_card.h

@@ -1,7 +1,7 @@
 /*
  *  oFono - Open Source Telephony - RIL-based devices
  *
- *  Copyright (C) 2015-2016 Jolla Ltd.
+ *  Copyright (C) 2015-2017 Jolla Ltd.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
@@ -55,6 +55,7 @@ typedef void (*ril_sim_card_cb_t)(struct ril_sim_card *sc, void *arg);
 struct ril_sim_card *ril_sim_card_new(GRilIoChannel *io, guint slot, int flags);
 struct ril_sim_card *ril_sim_card_ref(struct ril_sim_card *sc);
 void ril_sim_card_unref(struct ril_sim_card *sc);
+void ril_sim_card_request_status(struct ril_sim_card *self);
 gboolean ril_sim_card_ready(struct ril_sim_card *sc);
 gulong ril_sim_card_add_status_received_handler(struct ril_sim_card *sc,
 					ril_sim_card_cb_t cb, void *arg);

ofono/src/simfs.c

@@ -226,6 +226,9 @@ void sim_fs_notify_file_watches(struct sim_fs *fs, int id)
 		struct ofono_sim_context *context = l->data;
 		GSList *k;
 
+		if (context->file_watches == NULL)
+			continue;
+
 		for (k = context->file_watches->items; k; k = k->next) {
 			struct file_watch *w = k->data;
 			ofono_sim_file_changed_cb_t notify = w->item.notify;