smatch_kernel_netdev_priv.c

   1 /*
   2  * Copyright 2023 Linaro Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  */
  17
  18 #include "smatch.h"
  19 #include "smatch_extra.h"
  20
  21 static int my_id;
  22
  23 static void match_netdev_priv(const char *fn, struct expression *expr, void *unused)
  24 {
  25
  26         struct expression *right, *arg;
  27
  28         right = strip_expr(expr->right);
  29         if (right->type != EXPR_CALL)
  30                 return;
  31
  32         arg = get_argument_from_call_expr(right->args, 0);
  33         arg = strip_expr(arg);
  34         if (!arg || arg->type != EXPR_SYMBOL)
  35                 return;
  36
  37         set_state_expr(my_id, arg, alloc_state_expr(expr->left));
  38 }
  39
  40 struct expression *get_netdev_priv(struct expression *dev)
  41 {
  42         struct smatch_state *state;
  43
  44         state = get_state_expr(my_id, dev);
  45         if (!state)
  46                 return NULL;
  47         return state->data;
  48 }
  49
  50 void register_kernel_netdev_priv(int id)
  51 {
  52         if (option_project != PROJ_KERNEL)
  53                 return;
  54
  55         my_id = id;
  56         set_dynamic_states(my_id);
  57         add_function_assign_hook("netdev_priv", &match_netdev_priv, NULL);
  58 }