hfs_fscheck(TSK_FS_INFO * fs, FILE * hFile)
{
    tsk_error_reset();
    tsk_error_set_errno(TSK_ERR_FS_UNSUPFUNC);
    tsk_error_set_errstr("fscheck not implemented for HFS yet");
    return 1;
}

The product reads data past the end, or before the beginning, of the intended buffer.