my driver initially used ExAllocatePool to request a piece of PagedPool memory for pointer P, but in the following process, pointer P changed until it became NULL. At this point, if I call ExFreePool (P) to free up memory space, the blue screen will occur because P is a null pointer, so how can I free up the memory space I applied for before? If you only apply for it without releasing it, it is easy to cause a memory leak.
Thank you for the answer of the great god who is in trouble to know.
needs to use a constant to hold the pointer before changing, and then release the space that the constant points to. After the space application is made, the size and address will not change.
you can use a temporary pointer to point to the pointer with space to do the PP-- operation, which is usually like this
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