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Prevent crash when we can't write to editor cache or config path

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This can happen if users somehow got wrong user permissions assigned to
their Godot cache, config or data paths (e.g. `~/.config/godot`).

The error messages should give them a hint as to what the issue may be.

Fixes #33199.

There may be other situations that still lead to a crash, we need to
review all uses of `FileAccess::open` with `FileAccess::WRITE` mode to
ensure that proper pointer validation is done.
This commit is contained in:
Rémi Verschelde 2019-10-31 15:14:49 +01:00
parent 55fd63d9de
commit 565f7183aa
2 changed files with 20 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
editor/editor_file_system.cpp
View file

@ -325,15 +325,13 @@ void EditorFileSystem::_save_filesystem_cache() {
String fscache = EditorSettings::get_singleton()->get_project_settings_dir().plus_file(CACHE_FILE_NAME);
FileAccess *f = FileAccess::open(fscache, FileAccess::WRITE);
if (f == NULL) {
ERR_PRINTS("Error writing fscache '" + fscache + "'.");
} else {
ERR_FAIL_COND_MSG(!f, "Cannot create file '" + fscache + "'. Check user write permissions.");
f->store_line(filesystem_settings_version_for_import);
_save_filesystem_cache(filesystem, f);
f->close();
memdelete(f);
}
}
void EditorFileSystem::_thread_func(void *_userdata) {
@ -1373,6 +1371,7 @@ void EditorFileSystem::_save_late_updated_files() {
//files that already existed, and were modified, need re-scanning for dependencies upon project restart. This is done via saving this special file
String fscache = EditorSettings::get_singleton()->get_project_settings_dir().plus_file("filesystem_update4");
FileAccessRef f = FileAccess::open(fscache, FileAccess::WRITE);
ERR_FAIL_COND_MSG(!f, "Cannot create file '" + fscache + "'. Check user write permissions.");
for (Set<String>::Element *E = late_update_files.front(); E; E = E->next()) {
f->store_line(E->get());
}

11
editor/editor_resource_preview.cpp
View file

@ -201,9 +201,8 @@ void EditorResourcePreview::_generate_preview(Ref<ImageTexture> &r_texture, Ref<
if (has_small_texture) {
ResourceSaver::save(cache_base + "_small.png", r_small_texture);
}
Error err;
FileAccess *f = FileAccess::open(cache_base + ".txt", FileAccess::WRITE, &err);
ERR_FAIL_COND_MSG(err != OK, "Cannot create file '" + cache_base + ".txt'.");
FileAccess *f = FileAccess::open(cache_base + ".txt", FileAccess::WRITE);
ERR_FAIL_COND_MSG(!f, "Cannot create file '" + cache_base + ".txt'. Check user write permissions.");
f->store_line(itos(thumbnail_size));
f->store_line(itos(has_small_texture));
f->store_line(itos(FileAccess::get_modified_time(p_item.path)));
@ -295,12 +294,18 @@ void EditorResourcePreview::_thread() {
//update modified time
f = FileAccess::open(file, FileAccess::WRITE);
if (!f) {
// Not returning as this would leave the thread hanging and would require
// some proper cleanup/disabling of resource preview generation.
ERR_PRINTS("Cannot create file '" + file + "'. Check user write permissions.");
} else {
f->store_line(itos(thumbnail_size));
f->store_line(itos(has_small_texture));
f->store_line(itos(modtime));
f->store_line(md5);
memdelete(f);
}
}
} else {
memdelete(f);
}