Fix explicit NULL dereferenced/dereference before null check warnings

core_info.c

@@ -83,7 +83,7 @@ static void core_info_list_resolve_all_firmware(
       core_info_t *info     = (core_info_t*)&core_info_list->list[i];
       config_file_t *config = (config_file_t*)info->config_data;
 
-      if (!info || !config)
+      if (!config)
          continue;
 
       if (!config_get_uint(config, "firmware_count", &count))

frontend/drivers/platform_linux.c

@@ -833,9 +833,7 @@ static void check_proc_acpi_sysfs_ac_adapter(const char * node, bool *have_ac)
    if (strstr((char*)buf, "1"))
       *have_ac = true;
 
-   if (buf)
-      free(buf);
-   buf = NULL;
+   free(buf);
 }
 
 static bool next_string(char **_ptr, char **_str)

gfx/video_thread_wrapper.c

@@ -348,7 +348,7 @@ static bool video_thread_handle_packet(
              * it's called in this "special" way. */
             thr->frame.within_thread = true;
 
-            if (thr->driver && thr->driver->read_viewport)
+            if (thr->driver->read_viewport)
                ret = thr->driver->read_viewport(thr->driver_data,
                      (uint8_t*)pkt.data.v);
 

input/drivers_hid/libusb_hid.c

@@ -515,8 +515,7 @@ static void libusb_hid_free(void *data)
    libusb_hotplug_deregister_callback(hid->ctx, hid->hp);
 
    libusb_exit(hid->ctx);
-   if (hid)
-      free(hid);
+   free(hid);
 }
 
 static void poll_thread(void *data)

libretro-common/rthreads/rsemaphore.c

@@ -59,11 +59,13 @@ ssem_t *ssem_new(int value)
    return semaphore;
 
 error:
-   if (semaphore->mutex)
-      slock_free(semaphore->mutex);
-   semaphore->mutex = NULL;
    if (semaphore)
+   {
+      if (semaphore->mutex)
+         slock_free(semaphore->mutex);
+      semaphore->mutex = NULL;
       free((void*)semaphore);
+   }
    return NULL;
 }
 

menu/cbs/menu_cbs_deferred_push.c

@@ -200,14 +200,13 @@ static int deferred_push_cursor_manager_list_deferred_query_subsearch(
       goto end;
 
    strlcpy(info->path,   str_list->elems[1].data, sizeof(info->path));
-   strlcpy(info->path_b,    str_list->elems[0].data, sizeof(info->path_b));
-   strlcpy(info->path_c,    query, sizeof(info->path_c));
+   strlcpy(info->path_b, str_list->elems[0].data, sizeof(info->path_b));
+   strlcpy(info->path_c, query, sizeof(info->path_c));
 
    ret = deferred_push_dlist(info, DISPLAYLIST_DATABASE_QUERY);
 
 end:
-   if (str_list)
-      string_list_free(str_list);
+   string_list_free(str_list);
 #endif
    return ret;
 }

menu/drivers/zarch.c

@@ -403,9 +403,6 @@ static bool zarch_zui_tab(zui_t *zui, struct zui_tabbed *tab,
    const float   *bg = zui_bg_panel;
    bool selected     = tab->tab_selection == tab_id; /* TODO/FIXME */
 
-   if (!zui || !tab )
-      return false;
-
    if (!width)
    {
       if (!zui->fb_buf)
@@ -739,9 +736,6 @@ static int zarch_zui_render_lay_root(zui_t *zui)
    tabbed.width            = zui->width - 290 - 40;
    zui->next_selection_set = false;
 
-   if (!zui)
-      return 1;
-
    if (zarch_zui_render_lay_root_recent(zui, &tabbed))
       return 0;
    if (zarch_zui_render_lay_root_load  (zui, &tabbed))

menu/menu_entries.c

@@ -50,8 +50,7 @@ static void menu_list_free_list(file_list_t *list)
       menu_driver_ctl(RARCH_MENU_CTL_LIST_FREE, &list_info);
    }
 
-   if (list)
-      file_list_free(list);
+   file_list_free(list);
 }
 
 static void menu_list_free(menu_list_t *menu_list)

menu/menu_input.c

@@ -195,7 +195,8 @@ void menu_input_st_hex_cb(void *userdata, const char *str)
          unsigned *ptr = (unsigned*)setting_get_ptr(setting);
          if (str[0] == '#')
             str++;
-         *ptr = strtoul(str, NULL, 16);
+         if (ptr)
+            *ptr = strtoul(str, NULL, 16);
       }
    }
 

tasks/task_database.c

@@ -411,8 +411,7 @@ static int task_database_iterate_crc_lookup(
    if (db_state->list_index < db_state->list->size)
       return 1;
 
-   if (db_state->info)
-      database_info_list_free(db_state->info);
+   database_info_list_free(db_state->info);
    return 0;
 }
 
@@ -488,8 +487,7 @@ static int task_database_iterate_serial_lookup(
    if (db_state->list_index < db_state->list->size)
       return 1;
 
-   if (db_state->info)
-      database_info_list_free(db_state->info);
+   database_info_list_free(db_state->info);
    return 0;
 }
 

tasks/task_image.c

@@ -68,7 +68,7 @@ static int cb_image_menu_upload_generic(void *data, size_t len)
    nbio_handle_t        *nbio = (nbio_handle_t*)data;
    nbio_image_handle_t *image = (nbio_image_handle_t*)nbio->data;
 
-   if (!nbio || !image)
+   if (!image)
       return -1;
 
    if (image->processing_final_state == IMAGE_PROCESS_ERROR ||
@@ -125,11 +125,11 @@ static int task_image_process(
 
 static int cb_image_menu_generic(nbio_handle_t *nbio)
 {
+   int retval;
    unsigned width = 0, height = 0;
    nbio_image_handle_t *image = (nbio_image_handle_t*)nbio->data;
-   int retval;
 
-   if (!nbio || !image)
+   if (!image)
       return -1;
 
    retval = task_image_process(nbio, &width, &height);
@@ -157,11 +157,11 @@ static int cb_image_menu_thumbnail(void *data, size_t len)
 
 static int task_image_iterate_process_transfer(nbio_handle_t *nbio)
 {
-   unsigned i, width = 0, height = 0;
    int retval = 0;
+   unsigned i, width = 0, height = 0;
    nbio_image_handle_t *image = (nbio_image_handle_t*)nbio->data;
 
-   if (!nbio || !image)
+   if (!image)
       return -1;
 
    for (i = 0; i < image->processing_pos_increment; i++)
@@ -184,7 +184,7 @@ static int task_image_iterate_transfer(nbio_handle_t *nbio)
    unsigned i;
    nbio_image_handle_t *image = (nbio_image_handle_t*)nbio->data;
 
-   if (!nbio || !image)
+   if (!image)
       goto error;
 
    if (image->is_finished)

tasks/task_overlay.c

@@ -101,7 +101,6 @@ static bool rarch_task_overlay_load_desc(
    char conf_key[64]                    = {0};
    char overlay_desc_normalized_key[64] = {0};
    char overlay[256]                    = {0};
-   char *save                           = NULL;
    char *key                            = NULL;
    struct string_list *list             = NULL;
    const char *x                        = NULL;
@@ -174,12 +173,11 @@ static bool rarch_task_overlay_load_desc(
          }
          else
          {
-            const char *tmp = NULL;
+            char      *save = NULL;
+            const char *tmp = strtok_r(key, "|", &save);
 
             desc->type = OVERLAY_TYPE_BUTTONS;
 
-            tmp = strtok_r(key, "|", &save);
-
             for (; tmp; tmp = strtok_r(NULL, "|", &save))
             {
                if (!string_is_equal(tmp, "nul"))