memcheck/tests/xml1.c

   1
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 static void* return_arg(void* p);
   6 int frame3 ( void )
   7 {
   8   int *a = malloc(10 * sizeof(int));
   9
  10   // bad address;
  11   int n = a[10];
  12
  13   // undefined condition
  14   if (a[5] == 42) {
  15     printf("hello from frame3().  The answer is 42.\n");
  16   } else {
  17     printf("hello from frame3().  The answer is not 42.\n");
  18   }
  19
  20   // undefined address (careful ..)
  21   n = a[  a[0] & 7  ];
  22
  23   // invalid free, the second time
  24   free(a);
  25   free(a);
  26
  27   // more invalid frees
  28   free(return_arg(&n));
  29
  30   // leak ..
  31   a = malloc(99 * sizeof(int));
  32
  33   // pass garbage to the exit syscall
  34   return n;
  35 }
  36
  37 int frame2 ( void )
  38 {
  39   return frame3() - 1;
  40 }
  41
  42 int frame1 ( void )
  43 {
  44   return frame2() + 1;
  45 }
  46
  47 int main ( void )
  48 {
  49   int ret = frame1() - 1;
  50
  51 #if defined(VGO_solaris)
  52   /* Avoid reporting possible memory leak on finish when both FILE->base
  53      and FILE->ptr point to the middle of a buffer allocated in _findbuf()
  54      for stdout. */
  55   fcloseall();
  56 #endif
  57   return ret;
  58 }
  59
  60 /*
  61  * The only purpose of the function below is to make sure that gcc 4.4.x does
  62  * not print the following warning during the compilation of this test program:
  63  * warning: attempt to free a non-heap object
  64  */
  65 static void* return_arg(void* p)
  66 {
  67    return p;
  68 }
  69