1 
2 #include <stdlib.h>
3 #include <sys/types.h>
4 #include <unistd.h>
5 #include <assert.h>
6 
do_child_badness(char * p)7 void do_child_badness ( char* p )
8 {
9    /* Free it a second time */
10    free(p);
11 }
12 
do_parent_badness(char * p)13 void do_parent_badness ( char* p )
14 {
15    /* Do a write off the end */
16    p[10] = 42;
17 }
18 
19 
main(void)20 int main ( void )
21 {
22   pid_t child;
23   char* p = malloc(10); assert(p);
24   free(p);
25 
26   /* parent does something bad */
27   p[5] = 22;
28 
29   child = fork();
30   assert(child != -1); /* assert fork did not fail */
31 
32   if (child == 0) {
33      /* I am the child */
34      do_child_badness(p);
35   } else {
36      /* I am the parent */
37      do_parent_badness(p);
38   }
39 
40   return 0;
41 
42 }
43