Understanding malloc and pointer incrementation with free

 

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  • What happens if I try to access memory beyond a malloc()'d region? 5 answers

    • What you are doing is undefined behavior. 

    int *p = (int *) malloc(sizeof(int));

    This allocates sizeof(int) bytes starting from the address returned by malloc .

    When you do 

    *(p+1) = 41;

    you are dereferencing to a memory location which has not been allocated on the heap. Its address is p + sizeof(int) which is an not managed address.

    This yields undefined behavior and every conclusion you can draw by observing the results is irrelevant .

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