From 369d899f498325e38b6c3dc1b9201b26b3180f4d Mon Sep 17 00:00:00 2001
From: twinaphex <libretro@gmail.com>
Date: Thu, 17 Jul 2014 03:42:53 +0200
Subject: [PATCH] Make message queue functions more robust

---
 message_queue.c | 14 ++++++++++----
 settings_data.c |  9 ++++++---
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/message_queue.c b/message_queue.c
index 2097acb8d8..f7256884c5 100644
--- a/message_queue.c
+++ b/message_queue.c
@@ -55,14 +55,17 @@ msg_queue_t *msg_queue_new(size_t size)
 
 void msg_queue_free(msg_queue_t *queue)
 {
-   msg_queue_clear(queue);
-   free(queue->elems);
+   if (queue)
+   {
+      msg_queue_clear(queue);
+      free(queue->elems);
+   }
    free(queue);
 }
 
 void msg_queue_push(msg_queue_t *queue, const char *msg, unsigned prio, unsigned duration)
 {
-   if (queue->ptr >= queue->size)
+   if (!queue || queue->ptr >= queue->size)
       return;
 
    struct queue_elem *new_elem = (struct queue_elem*)calloc(1, sizeof(struct queue_elem));
@@ -91,6 +94,9 @@ void msg_queue_push(msg_queue_t *queue, const char *msg, unsigned prio, unsigned
 
 void msg_queue_clear(msg_queue_t *queue)
 {
+   if (!queue)
+      return;
+
    size_t i;
    for (i = 1; i < queue->ptr; i++)
    {
@@ -108,7 +114,7 @@ void msg_queue_clear(msg_queue_t *queue)
 
 const char *msg_queue_pull(msg_queue_t *queue)
 {
-   if (queue->ptr == 1) // Nothing in queue. :(
+   if (!queue || queue->ptr == 1) // Nothing in queue.
       return NULL;
 
    struct queue_elem *front = queue->elems[1];
diff --git a/settings_data.c b/settings_data.c
index 999810bc36..86645e2441 100644
--- a/settings_data.c
+++ b/settings_data.c
@@ -615,9 +615,12 @@ static void general_change_handler(const void *data)
         g_settings.video.fullscreen_y = *setting->value.unsigned_integer;
     else if (!strcmp(setting->name, "video_refresh_rate"))
     {
-        driver_set_monitor_refresh_rate(*setting->value.fraction);
-        /* In case refresh rate update forced non-block video. */
-        video_set_nonblock_state_func(false);
+       if (driver.video && driver.video_data)
+       {
+          driver_set_monitor_refresh_rate(*setting->value.fraction);
+          /* In case refresh rate update forced non-block video. */
+          video_set_nonblock_state_func(false);
+       }
     }
     else if (!strcmp(setting->name,  "video_aspect_ratio"))
         g_settings.video.aspect_ratio = *setting->value.fraction;