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Double Delete

CS253 Double Delete

Double Delete

Every call to new must be matched by exactly one delete.

Not zero, and not two. One.

Similarly, every call to new [] must be matched by exactly one delete [].

Zero Delete

If you don’t call delete, then the memory is forgotten. We call this a memory leak.

Sure, the memory will be implicitly freed when the program ends. However, some programs run for a good long time before they end.

Multiple Delete

What happens if you call delete more than once?

float *p = new float[100];
delete p;
delete p;

free(): double free detected in tcache 2
SIGABRT: Aborted