1·In this context, an invalid pointer is one that points to an invalid region in memory, is NULL, contains an unaligned pointer, points to memory block smaller than necessary, and so on.
在这个上下文，一个无效的指针是一个指向无效内存中的区域，是NULL，包含一个不对齐的指针，指向的内存块比必须的还小，等等。