20 
  21 static int my_id;
  22 
  23 static int err_ptr = 0;
  24 static int returns_null = 0;
  25 
  26 static void match_err_ptr(struct expression *expr)
  27 {
  28         expr = strip_expr(expr);
  29         if (!expr)
  30                 return;
  31         if (expr->type != EXPR_CALL)
  32                 return;
  33 
  34         if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
  35                 return;
  36         if (!strcmp(expr->fn->symbol->ident->name, "ERR_PTR"))
  37                 err_ptr = 1;
  38 }
  39 
  40 extern int check_assigned_expr_id;
  41 static void match_return(struct expression *ret_value)
  42 {
  43         struct state_list *slist;
  44         struct sm_state *tmp;
  45         sval_t sval;
  46 
  47         if (__inline_fn)
  48                 return;
  49         match_err_ptr(ret_value);
  50         slist = get_possible_states_expr(check_assigned_expr_id, ret_value);
  51         FOR_EACH_PTR(slist, tmp) {
  52                 if (tmp->state == &undefined || tmp->state == &merged)
  53                         continue;
  54                 match_err_ptr((struct expression *)tmp->state->data);
  55         } END_FOR_EACH_PTR(tmp);
  56 
  57         if (get_implied_value(ret_value, &sval)) {
  58                 if (sval.value == 0)
  59                         returns_null = 1;
  60         }

  20 
  21 static int my_id;
  22 
  23 static int err_ptr = 0;
  24 static int returns_null = 0;
  25 
  26 static void match_err_ptr(struct expression *expr)
  27 {
  28         expr = strip_expr(expr);
  29         if (!expr)
  30                 return;
  31         if (expr->type != EXPR_CALL)
  32                 return;
  33 
  34         if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
  35                 return;
  36         if (!strcmp(expr->fn->symbol->ident->name, "ERR_PTR"))
  37                 err_ptr = 1;
  38 }
  39 

  40 static void match_return(struct expression *ret_value)
  41 {
  42         struct state_list *slist;
  43         struct sm_state *tmp;
  44         sval_t sval;
  45 
  46         if (__inline_fn)
  47                 return;
  48         match_err_ptr(ret_value);
  49         slist = get_possible_states_expr(check_assigned_expr_id, ret_value);
  50         FOR_EACH_PTR(slist, tmp) {
  51                 if (tmp->state == &undefined || tmp->state == &merged)
  52                         continue;
  53                 match_err_ptr((struct expression *)tmp->state->data);
  54         } END_FOR_EACH_PTR(tmp);
  55 
  56         if (get_implied_value(ret_value, &sval)) {
  57                 if (sval.value == 0)
  58                         returns_null = 1;
  59         }