[net-next:master 136/385] net/sched/cls_route.c:565:22-26: ERROR: f is NULL but dereferenced.

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 
master
head:   fd9527f404d51e50f40dac0d9a69f2eff3dac33e
commit: b9a24bb76bf611a5268ceffe04219e6ad264559b [136/385] net_sched: properly 
handle failure case of tcf_exts_init()


coccinelle warnings: (new ones prefixed by >>)

>> net/sched/cls_route.c:565:22-26: ERROR: f is NULL but dereferenced.

vim +565 net/sched/cls_route.c

   549                                          *fp = f->next;
   550                                          break;
   551                                  }
   552                          }
   553                  }
   554          }
   555  
   556          route4_reset_fastmap(head);
   557          *arg = (unsigned long)f;
   558          if (fold) {
   559                  tcf_unbind_filter(tp, &fold->res);
   560                  call_rcu(&fold->rcu, route4_delete_filter);
   561          }
   562          return 0;
   563  
   564  errout:
 > 565          tcf_exts_destroy(&f->exts);
   566          kfree(f);
   567          return err;
   568  }
   569  
   570  static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg)
   571  {
   572          struct route4_head *head = rtnl_dereference(tp->root);
   573          unsigned int h, h1;

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