validation/sm_get_user1.c

   1 #include "check_debug.h"
   2
   3 int frob(void);
   4 #define get_user(x, y) ({ int __val_gu = frob(); x = __val_gu; 0; })
   5
   6 void func(void)
   7 {
   8         int *user_ptr;
   9         int foo, bar;
  10         unsigned int x;
  11
  12         get_user(foo, user_ptr);
  13         bar = foo + 1;
  14
  15         get_user(bar, user_ptr);
  16         if (bar > foo)
  17                 bar = foo;
  18         foo = bar * 8;
  19
  20         get_user(x, user_ptr);
  21         if (x > foo)
  22                 x = foo;
  23         foo = x * 8;
  24
  25         get_user(x, user_ptr);
  26         foo = x * 8;
  27 }
  28 /*
  29  * check-name: smatch get_user() #1
  30  * check-command: smatch -p=kernel -I.. sm_get_user1.c
  31  *
  32  * check-output-start
  33 sm_get_user1.c:13 func() warn: check for integer over/underflow 'foo'
  34 sm_get_user1.c:18 func() warn: check for integer underflow 'bar'
  35 sm_get_user1.c:26 func() warn: check for integer overflow 'x'
  36  * check-output-end
  37  */