When the IBUS initialization fails a string is leaked:

        ibus_addr_file = SDL_strdup(addr_file); // Allocate memory

        addr = IBus_ReadAddressFromFile(addr_file);
        if (!addr) {
            SDL_free(addr_file);
            return SDL_FALSE; // This will make the SDL_IBus_Quit not called hence ibus_addr_file is not freed
        }

Possible solution: Move the ibus_addr_file assignment to the bottom and make it conditional on result (only copy if true)

Found via LSAN after a simple SDL_InitVideo(); SDL_Quit(); from inside dynamically loaded shared library.