validation/sm_user_data4.c

   1 #include "check_debug.h"
   2
   3 int copy_from_user(void *dest, void *src, int size);
   4
   5 struct ear {
   6         int x, y;
   7 };
   8
   9 void *src;
  10 int returns_user_data(void)
  11 {
  12         int x;
  13
  14         copy_from_user(&x, src, sizeof(int));
  15         return x;
  16 }
  17
  18 struct ear *dest;
  19 struct ear *returns_user_member(void)
  20 {
  21         copy_from_user(&dest->x, src, sizeof(int));
  22         return dest;
  23 }
  24 void test(void)
  25 {
  26         struct ear *p;
  27         int x;
  28
  29         x = returns_user_data();
  30         __smatch_state("check_user_data", "x");
  31         p = returns_user_member();
  32         __smatch_state("check_user_data", "p");
  33         __smatch_state("check_user_data", "p->x");
  34 }
  35
  36 /*
  37  * check-name: smatch user data #4
  38  * check-command: smatch -p=kernel -I.. sm_user_data4.c
  39  *
  40  * check-output-start
  41 sm_user_data4.c:30 test() 'x' = 'user_data'
  42 sm_user_data4.c:32 test() check_user_data 'p' not found
  43 sm_user_data4.c:33 test() 'p->x' = 'user_data'
  44  * check-output-end
  45  */