memory corruption

Question

i was running a small c program:

#include
int main()
{
char *p;
p = (char *)malloc(10);
free(p);
free(p);
free(p);
printf(\"\\npointer is freed!!\         


        

Answer 1

Heap corruption need not cause the problem immediately. It could so happen that the freed memory ( or part of the memory) is used to allocat some other structure and then it might cause problem. freeing memory more than once is always UB (undefined) and should not be done even if you don't see evil effects at that moment.