validation/sm_redundant_check.c

   1 void free(void *ptr);
   2 void frob(void *ptr);
   3
   4 int x,y,z;
   5 void func (void)
   6 {
   7         if (x)
   8                 free(x);
   9         if (y)
  10                 frob(y);
  11         free(y);
  12         if (z) {
  13                 free(z);
  14         }
  15 }
  16
  17
  18 /*
  19  * check-name: Redundant NULL check
  20  * check-command: smatch sm_redundant_check.c
  21  *
  22  * check-output-start
  23 sm_redundant_check.c:8 func() info: redundant null check on x calling free()
  24 sm_redundant_check.c:13 func() info: redundant null check on z calling free()
  25  * check-output-end
  26  */