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Dynamic memory managers are not required to clear freed memory and generally do not because of the additional runtime overhead. Furthermore, dynamic memory managers are free to reallocate this same memory. As a result, it is possible to accidently leak sensitive information if it is not cleared before calling a function that frees dynamic memory. Programmers cannot rely on memory being cleared during allocation either \[[MEM33-C. Do not assume memory allocation routines initialize memory]\]. |
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