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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.

(cherry picked from commit 565f7183aa)
This commit is contained in:
Rémi Verschelde 2019-10-31 15:14:49 +01:00
parent e46f2be4d7
commit 5f314c54ff
2 changed files with 25 additions and 10 deletions
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17
editor/editor_file_system.cpp
View file

@ -322,13 +322,14 @@ void EditorFileSystem::_save_filesystem_cache() {
FileAccess *f = FileAccess::open(fscache, FileAccess::WRITE);
if (f == NULL) {
ERR_PRINTS("Error writing fscache: " + fscache);
} else {
f->store_line(filesystem_settings_version_for_import);
_save_filesystem_cache(filesystem, f);
f->close();
memdelete(f);
ERR_EXPLAIN("Cannot create file '" + fscache + "'. Check user write permissions.");
ERR_FAIL();
}
f->store_line(filesystem_settings_version_for_import);
_save_filesystem_cache(filesystem, f);
f->close();
memdelete(f);
}
void EditorFileSystem::_thread_func(void *_userdata) {
@ -1370,6 +1371,10 @@ 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);
if (!f) {
ERR_EXPLAIN("Cannot create file '" + fscache + "'. Check user write permissions.");
ERR_FAIL();
}
for (Set<String>::Element *E = late_update_files.front(); E; E = E->next()) {
f->store_line(E->get());
}

18
editor/editor_resource_preview.cpp
View file

@ -177,6 +177,10 @@ void EditorResourcePreview::_generate_preview(Ref<ImageTexture> &r_texture, Ref<
ResourceSaver::save(cache_base + "_small.png", r_small_texture);
}
FileAccess *f = FileAccess::open(cache_base + ".txt", FileAccess::WRITE);
if (!f) {
ERR_EXPLAIN("Cannot create file '" + cache_base + ".txt'. Check user write permissions.");
ERR_FAIL();
}
f->store_line(itos(thumbnail_size));
f->store_line(itos(has_small_texture));
f->store_line(itos(FileAccess::get_modified_time(p_item.path)));
@ -267,10 +271,16 @@ void EditorResourcePreview::_thread() {
//update modified time
f = FileAccess::open(file, FileAccess::WRITE);
f->store_line(itos(modtime));
f->store_line(itos(has_small_texture));
f->store_line(md5);
memdelete(f);
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(modtime));
f->store_line(itos(has_small_texture));
f->store_line(md5);
memdelete(f);
}
}
} else {
memdelete(f);