Fix app manager/framework issues reported by Coverity (#1155)

runtime_sensor.c: add return value check for os_mutex_init
                             fix find_sensor_client
sensor_mgr_ref.c: add return value check for init_sensor_framework
app_manager_host.c: add return value check for app_manager_host_init
module_wasm_app.c: add bh_assert for m_data
                                   fix mkdir potential issue
sample littlevgl/gui/simple: add return value check for init_sensor_framework
host_tool: add more check for g_conn_fd

core/app-framework/sensor/native/runtime_sensor.c

@@ -309,7 +309,13 @@ add_sys_sensor(char *name, char *description, int instance,
         g_sys_sensors = s;
     }
 
-    os_mutex_init(&s->lock);
+    if (os_mutex_init(&s->lock) != 0) {
+        if (s->description) {
+            wasm_runtime_free(s->description);
+        }
+        wasm_runtime_free(s->name);
+        wasm_runtime_free(s);
+    }
 
     return s;
 }
@@ -358,6 +364,7 @@ find_sensor_client(sys_sensor_t *sensor, unsigned int client_id,
             return c;
         }
         else {
+            prev = c;
             c = c->next;
         }
     }

core/app-framework/sensor/native/runtime_sensor.h

@@ -59,7 +59,7 @@ check_sensor_timers();
 void
 reschedule_sensor_read();
 
-void
+bool
 init_sensor_framework();
 void
 start_sensor_framework();

core/app-framework/sensor/native/sensor_mgr_ref.c

@@ -106,12 +106,18 @@ cb_wakeup_thread()
 void
 set_sensor_reshceduler(void (*callback)());
 
-void
+bool
 init_sensor_framework()
 {
-    // init the mutext and conditions
-    os_cond_init(&cond);
-    os_mutex_init(&mutex);
+    /* init the mutext and conditions */
+    if (os_cond_init(&cond) != 0) {
+        return false;
+    }
+
+    if (os_mutex_init(&mutex) != 0) {
+        os_cond_destroy(&cond);
+        return false;
+    }
 
     set_sensor_reshceduler(cb_wakeup_thread);
 
@@ -119,6 +125,8 @@ init_sensor_framework()
                                app_mgr_sensor_event_callback);
 
     wasm_register_cleanup_callback(sensor_cleanup_callback);
+
+    return true;
 }
 
 void

core/app-mgr/app-manager/app_manager_host.c

@@ -264,15 +264,21 @@ aee_host_msg_callback(void *msg, uint32_t msg_len)
 bool
 app_manager_host_init(host_interface *interface)
 {
-    os_mutex_init(&host_lock);
+    if (os_mutex_init(&host_lock) != 0) {
+        return false;
+    }
     memset(&recv_ctx, 0, sizeof(recv_ctx));
 
     host_commu.init = interface->init;
     host_commu.send = interface->send;
     host_commu.destroy = interface->destroy;
 
-    if (host_commu.init != NULL)
-        return host_commu.init();
+    if (host_commu.init != NULL) {
+        if (!host_commu.init()) {
+            os_mutex_destroy(&host_lock);
+            return false;
+        }
+    }
 
     return true;
 }

core/app-mgr/app-manager/module_wasm_app.c

@@ -207,10 +207,12 @@ app_instance_queue_callback(void *queue_msg, void *arg)
 
     wasm_module_inst_t inst = (wasm_module_inst_t)arg;
     module_data *m_data = app_manager_get_module_data(Module_WASM_App, inst);
-    wasm_data *wasm_app_data = (wasm_data *)m_data->internal_data;
-    int message_type = bh_message_type(queue_msg);
+    wasm_data *wasm_app_data;
+    int message_type;
 
     bh_assert(m_data);
+    wasm_app_data = (wasm_data *)m_data->internal_data;
+    message_type = bh_message_type(queue_msg);
 
     if (message_type < BASE_EVENT_MAX) {
         switch (message_type) {
@@ -410,16 +412,15 @@ wasm_app_prepare_wasi_dir(wasm_module_t module, const char *module_name,
     p += module_name_len;
     *p++ = '\0';
 
-    /* Create a wasi dir for the module */
-    if (stat(wasi_dir_buf, &st) == 0) {
-        /* exist, but is a regular file, not a dir */
-        if (st.st_mode & S_IFREG)
-            return false;
-    }
-    else {
-        /* not exist, create it */
-        if (mkdir(wasi_dir_buf, 0777) != 0)
-            return false;
+    if (mkdir(wasi_dir_buf, 0777) != 0) {
+        if (errno == EEXIST) {
+            /* Failed due to dir already exist */
+            if ((stat(wasi_dir_buf, &st) == 0) && (st.st_mode & S_IFDIR)) {
+                return true;
+            }
+        }
+
+        return false;
     }
 
     return true;