Freeing Memory That Is Already Freed

The following program allocates some memory, and then releases it twice. On some operating systems, your program will raise a SEGV on the second free request.

int main ()

{

void *s;

/* Get some memory */

s = malloc(sizeof(int)*200);

/* Now release the memory */

free(s);

/* Error: Release it again */

free(s);

return 0;

}