Squash some more potential null pointer dereferences

frontend/frontend.c

@@ -360,10 +360,15 @@ returntype main_entry(signature())
 
    rarch_main_clear_state();
 
-   if (!(ret = (main_load_content(argc, argv, args,
-                  driver.frontend_ctx->environment_get,
-                  driver.frontend_ctx->process_args))))
-      return_var(ret);
+   if (driver.frontend_ctx)
+   {
+      if (!(ret = (main_load_content(argc, argv, args,
+         driver.frontend_ctx->environment_get,
+         driver.frontend_ctx->process_args))))
+      {
+         return_var(ret);
+      }
+   }
 
 #if defined(HAVE_MENU)
 #if defined(RARCH_CONSOLE) || defined(RARCH_MOBILE)

gfx/gl.c

@@ -203,8 +203,16 @@ static bool gl_shader_init(gl_t *gl)
    const char *shader_path = (g_settings.video.shader_enable && *g_settings.video.shader_path) ?
       g_settings.video.shader_path : NULL;
 
-   enum rarch_shader_type type = gfx_shader_parse_type(shader_path,
-         gl->core_context ? RARCH_SHADER_GLSL : DEFAULT_SHADER_TYPE);
+   enum rarch_shader_type type;
+
+   if (!gl)
+   {
+      RARCH_ERR("Invalid GL instance passed to %s", __FUNCTION__);
+      return false;
+   }
+
+   type = gfx_shader_parse_type(shader_path,
+      gl->core_context ? RARCH_SHADER_GLSL : DEFAULT_SHADER_TYPE);
 
    ret = 0;
 

input/input_common.c

@@ -1289,6 +1289,9 @@ unsigned input_translate_str_to_bind_id(const char *str)
 
 static void parse_hat(struct retro_keybind *bind, const char *str)
 {
+   if (!bind || !str)
+      return;
+
    if (!isdigit(*str))
       return;
 

message_queue.c

@@ -16,8 +16,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stddef.h>
-#include "message_queue.h"
 #include "boolean.h"
+#include "message_queue.h"
+#include "retroarch_logger.h"
 #include "compat/posix_string.h"
 
 struct queue_elem
@@ -72,6 +73,11 @@ void msg_queue_push(msg_queue_t *queue, const char *msg,
 
    struct queue_elem *new_elem = (struct queue_elem*)
       calloc(1, sizeof(struct queue_elem));
+   if (!new_elem)
+   {
+      RARCH_ERR("New element allocation failed in %s", __FUNCTION__);
+      return;
+   }
 
    new_elem->prio = prio;
    new_elem->duration = duration;

netplay.c

@@ -752,17 +752,28 @@ static bool get_info_spectate(netplay_t *handle)
    return ret;
 }
 
-static void init_buffers(netplay_t *handle)
+static bool init_buffers(netplay_t *handle)
 {
    unsigned i;
    handle->buffer = (struct delta_frame*)calloc(handle->buffer_size,
          sizeof(*handle->buffer));
+   
+   if (!handle->buffer)
+      return false;
+
    handle->state_size = pretro_serialize_size();
+
    for (i = 0; i < handle->buffer_size; i++)
    {
       handle->buffer[i].state = malloc(handle->state_size);
+
+      if (!handle->buffer[i].state)
+         return false;
+
       handle->buffer[i].is_simulated = true;
    }
+
+   return true;
 }
 
 netplay_t *netplay_new(const char *server, uint16_t port,
@@ -818,7 +829,9 @@ netplay_t *netplay_new(const char *server, uint16_t port,
 
       handle->buffer_size = frames + 1;
 
-      init_buffers(handle);
+      if (!init_buffers(handle))
+         goto error;
+
       handle->has_connection = true;
    }