move buflib_free invalid handle check to the function

allow buflib_free to check for invalid or already freed handles
within the function -- remove all the invalid handle guards thru core_free

Change-Id: Ibdcbc82760fc93b674c42283fca420d94907df8e

apps/action.c

@@ -1219,8 +1219,7 @@ int action_set_keymap_handle(int handle, int count)
     return -1;
 #else
     /* free an existing remap */
-    if (action_last.key_remap > 0)
-        action_last.key_remap = core_free(action_last.key_remap);
+    action_last.key_remap = core_free(action_last.key_remap);
 
     /* if clearing the remap, we're done */
     if (count <= 0 || handle <= 0)

apps/debug_menu.c

@@ -520,8 +520,7 @@ static int bf_action_cb(int action, struct gui_synclist* list)
             /* for some reason simplelist doesn't allow adding items here if
              * info.get_name is given, so use normal list api */
             gui_synclist_set_nb_items(list, core_get_num_blocks());
-            if (handle > 0)
-                core_free(handle);
+            core_free(handle);
         }
         action = ACTION_REDRAW;
     }

apps/gui/skin_engine/skin_backdrops.c

@@ -267,8 +267,7 @@ void skin_backdrop_unload(int backdrop_id)
     backdrops[backdrop_id].ref_count--;
     if (backdrops[backdrop_id].ref_count <= 0)
     {
-        if (backdrops[backdrop_id].buflib_handle > 0)
-            core_free(backdrops[backdrop_id].buflib_handle);
+        core_free(backdrops[backdrop_id].buflib_handle);
         backdrops[backdrop_id].buffer = NULL;
         backdrops[backdrop_id].buflib_handle = -1;
         backdrops[backdrop_id].loaded = false;

apps/gui/skin_engine/skin_parser.c

@@ -1829,9 +1829,7 @@ void skin_data_free_buflib_allocs(struct wps_data *wps_data)
 abort:
     wps_data->font_ids = PTRTOSKINOFFSET(skin_buffer, NULL); /* Safe if skin_buffer is NULL */
     wps_data->images = PTRTOSKINOFFSET(skin_buffer, NULL);
-    if (wps_data->buflib_handle > 0)
-        core_free(wps_data->buflib_handle);
-    wps_data->buflib_handle = -1;
+    wps_data->buflib_handle = core_free(wps_data->buflib_handle);
 #endif
 }
 

apps/playback.c

@@ -3683,8 +3683,7 @@ void audio_hard_stop(void)
 #ifdef PLAYBACK_VOICE
     voice_stop();
 #endif
-    if (audiobuf_handle > 0)
-        audiobuf_handle = core_free(audiobuf_handle);
+    audiobuf_handle = core_free(audiobuf_handle);
 }
 
 /* Resume playback if paused */

apps/plugin.c

@@ -839,8 +839,7 @@ int plugin_load(const char* plugin, const void* parameter)
         }
         lc_close(current_plugin_handle);
         current_plugin_handle = pfn_tsr_exit = NULL;
-        if (plugin_buffer_handle > 0)
-            plugin_buffer_handle = core_free(plugin_buffer_handle);
+        plugin_buffer_handle = core_free(plugin_buffer_handle);
     }
 
     splash(0, ID2P(LANG_WAIT));
@@ -921,8 +920,7 @@ int plugin_load(const char* plugin, const void* parameter)
     {   /* close handle if plugin is no tsr one */
         lc_close(current_plugin_handle);
         current_plugin_handle = NULL;
-        if (plugin_buffer_handle > 0)
-            plugin_buffer_handle = core_free(plugin_buffer_handle);
+        plugin_buffer_handle = core_free(plugin_buffer_handle);
     }
 
     talk_buffer_set_policy(TALK_BUFFER_DEFAULT);

apps/rbcodec_helpers.c

@@ -87,10 +87,7 @@ void tdspeed_free_buffers(int32_t **buffers, int nbuf)
 {
     for (int i = 0; i < nbuf; i++)
     {
-        if (handles[i] > 0)
-            core_free(handles[i]);
-
-        handles[i] = 0;
+        handles[i] = core_free(handles[i]);
         buffers[i] = NULL;
     }
 }

apps/recorder/pcm_record.c

@@ -1437,8 +1437,7 @@ static void on_close_recording(void)
     audio_set_output_source(AUDIO_SRC_PLAYBACK);
     pcm_apply_settings();
 
-    if (pcmrec_handle > 0)
-        pcmrec_handle = core_free(pcmrec_handle);
+    pcmrec_handle = core_free(pcmrec_handle);
     talk_buffer_set_policy(TALK_BUFFER_DEFAULT);
 
     send_event(RECORDING_EVENT_STOP, NULL);

apps/talk.c

@@ -226,7 +226,7 @@ static int shrink_callback(int handle, unsigned hints, void *start, size_t old_s
 
         mutex_lock(&read_buffer_mutex);
         /* the clip buffer isn't usable without index table */
-        if (handle == index_handle && talk_handle > 0)
+        if (handle == index_handle)
             talk_handle = core_free(talk_handle);
         if (h)
             *h = core_free(handle);
@@ -546,8 +546,7 @@ static bool create_clip_buffer(size_t max_size)
 
 alloc_err:
     talk_status = TALK_STATUS_ERR_ALLOC;
-    if (index_handle > 0)
-        index_handle = core_free(index_handle);
+    index_handle = core_free(index_handle);
     return false;
 }
 static inline int load_voicefile_failure(int fd)
@@ -621,8 +620,7 @@ static bool load_voicefile_data(int fd)
 
     /* just allocate, populate on an as-needed basis later
      * re-create the clip buffer to ensure clip_ctx is up-to-date */
-    if (talk_handle > 0)
-        talk_handle = core_free(talk_handle);
+    talk_handle = core_free(talk_handle);
     if (!create_clip_buffer(voicebuf_size))
         return false;
 
@@ -823,8 +821,8 @@ void talk_init(void)
     voicefile_size = has_voicefile = 0;
     /* need to free these as their size depends on the voice file, and
      * this function is called when the talk voice file changes */
-    if (index_handle > 0) index_handle = core_free(index_handle);
-    if (talk_handle  > 0) talk_handle  = core_free(talk_handle);
+    index_handle = core_free(index_handle);
+    talk_handle  = core_free(talk_handle);
     /* don't free thumb handle, it doesn't depend on the actual voice file
      * and so we can re-use it if it's already allocated in any event */
 

firmware/buflib.c

@@ -820,6 +820,8 @@ find_block_before(struct buflib_context *ctx, union buflib_data* block,
 int
 buflib_free(struct buflib_context *ctx, int handle_num)
 {
+    if (handle_num <= 0) /* invalid or already free */
+        return handle_num;
     union buflib_data *handle = ctx->handle_table - handle_num,
                       *freed_block = handle_to_block(ctx, handle_num),
                       *block, *next_block;

firmware/common/dircache.c

@@ -1963,8 +1963,7 @@ static int prepare_build(bool *realloced)
     int handle = reset_buffer();
     dircache_unlock();
 
-    if (handle > 0)
-        core_free(handle);
+    core_free(handle);
 
     handle = alloc_cache(size);
 
@@ -2164,8 +2163,7 @@ static void dircache_suspend_internal(bool freeit)
 
     dircache_unlock();
 
-    if (handle > 0)
-        core_free(handle);
+    core_free(handle);
 
     thread_wait(thread_id);
 
@@ -3179,7 +3177,7 @@ error:
     dircache_unlock();
 
 error_nolock:
-    if (rc < 0 && handle > 0)
+    if (rc < 0)
         core_free(handle);
 
     if (fd >= 0)

firmware/common/zip.c

@@ -237,8 +237,7 @@ static int zip_read_ed(struct zip* z) {
     rv = 0;
 
 bail:
-    if (mem_handle >= 0)
-        core_free(mem_handle);
+    core_free(mem_handle);
     return rv;
 }
 
@@ -337,10 +336,9 @@ static int zip_read_cd(struct zip* z, bool use_cb) {
     rv = 0;
 
 bail:
-    if (rv != 0 && cds_handle >= 0)
+    if (rv != 0)
         core_free(cds_handle);
-    if (mem_handle >= 0)
-        core_free(mem_handle);
+    core_free(mem_handle);
     return rv;
 }
 
@@ -497,8 +495,7 @@ static int zip_read_entries(struct zip* z) {
     rv = 0;
 
 bail:
-    if (mem_handle >= 0)
-        core_free(mem_handle);
+    core_free(mem_handle);
     return rv;
 }
 
@@ -754,10 +751,8 @@ struct zip* zip_open(const char* name, bool try_mem) {
 bail:
     if (file >= 0)
         close(file);
-    if (mem_handle >= 0)
-        core_free(mem_handle);
-    if (zip_handle >= 0)
-        core_free(zip_handle);
+    core_free(mem_handle);
+    core_free(zip_handle);
     return NULL;
 }
 
@@ -875,8 +870,7 @@ void zip_close(struct zip* z) {
 
     z->close(z);
 
-    if (z->cds_handle >= 0)
-        core_free(z->cds_handle);
+    core_free(z->cds_handle);
 
     core_free(z->zip_handle);
 }

firmware/font.c

@@ -604,8 +604,7 @@ void font_unload(int font_id)
             glyph_cache_save(font_id);
             close(pf->fd);
         }
-        if (handle > 0)
-            core_free(handle);
+        core_free(handle);
         buflib_allocations[font_id] = -1;
 
     }

firmware/linuxboot.c

@@ -221,8 +221,7 @@ int uimage_load(struct uimage_header* uh, size_t* out_size,
     ret = 0;
 
   err:
-    if(state_h > 0)
-        core_free(state_h);
+    core_free(state_h);
     if(out_h > 0) {
         if(ret == 0)
             ret = out_h;

firmware/target/mips/ingenic_x1000/installer-x1000.c

@@ -178,8 +178,7 @@ static void updater_cleanup(struct updater* u)
     if(u->tar && mtar_is_open(u->tar))
         mtar_close(u->tar);
 
-    if(u->buf_hnd >= 0)
-        core_free(u->buf_hnd);
+    core_free(u->buf_hnd);
 
     if(u->ndrv) {
         nand_close(u->ndrv);

firmware/usbstack/usb_storage.c

@@ -481,8 +481,7 @@ void usb_storage_init_connection(void)
 
 void usb_storage_disconnect(void)
 {
-    if (usb_handle > 0)
-        usb_handle = core_free(usb_handle);
+    usb_handle = core_free(usb_handle);
 }
 
 /* called by usb_core_transfer_complete() */

lib/x1000-installer/src/xf_nandio.c

@@ -75,10 +75,7 @@ int xf_nandio_init(struct xf_nandio* nio)
 
 void xf_nandio_destroy(struct xf_nandio* nio)
 {
-    if(nio->alloc_handle > 0) {
-        core_free(nio->alloc_handle);
-        nio->alloc_handle = 0;
-    }
+    nio->alloc_handle = core_free(nio->alloc_handle);
 
     if(nio->ndrv) {
         nand_lock(nio->ndrv);

lib/x1000-installer/src/xf_package.c

@@ -257,8 +257,5 @@ void xf_package_close(struct xf_package* pkg)
     if(mtar_is_open(pkg->tar))
         mtar_close(pkg->tar);
 
-    if(pkg->alloc_handle > 0) {
-        core_free(pkg->alloc_handle);
-        pkg->alloc_handle = 0;
-    }
+    pkg->alloc_handle = core_free(pkg->alloc_handle);
 }