Fix crash in asset browser when switching from file browser

When the file browser is in asset browser mode, it sets the callback
`filelist->prepare_filter_fn` to an asset browser specific function. This
function will segfault if there is no current asset library. Switching back
from asset browser to file browser would not reset that callback to
`NULL`, causing it to be called and crash Blender. This is now fixed.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/editors/space_file/filelist.c b/source/blender/editors/space_file/filelist.c
index a1b1c8cc363..e6575316aec 100644
--- a/source/blender/editors/space_file/filelist.c
+++ b/source/blender/editors/space_file/filelist.c
@@ -914,6 +914,9 @@ static void prepare_filter_asset_library(const FileList *filelist, FileListFilte
   if (!filter->asset_catalog_filter) {
     return;
   }
+  BLI_assert_msg(filelist->asset_library,
+                 "prepare_filter_asset_library() should only be called when the file browser is "
+                 "in asset browser mode");
 
   file_ensure_updated_catalog_filter_data(filter->asset_catalog_filter, filelist->asset_library);
 }
@@ -1876,11 +1879,13 @@ void filelist_settype(FileList *filelist, short type)
     case FILE_MAIN:
       filelist->check_dir_fn = filelist_checkdir_main;
       filelist->read_job_fn = filelist_readjob_main;
+      filelist->prepare_filter_fn = NULL;
       filelist->filter_fn = is_filtered_main;
       break;
     case FILE_LOADLIB:
       filelist->check_dir_fn = filelist_checkdir_lib;
       filelist->read_job_fn = filelist_readjob_lib;
+      filelist->prepare_filter_fn = NULL;
       filelist->filter_fn = is_filtered_lib;
       break;
     case FILE_ASSET_LIBRARY:
@@ -1900,6 +1905,7 @@ void filelist_settype(FileList *filelist, short type)
     default:
       filelist->check_dir_fn = filelist_checkdir_dir;
       filelist->read_job_fn = filelist_readjob_dir;
+      filelist->prepare_filter_fn = NULL;
       filelist->filter_fn = is_filtered_file;
       break;
   }