[melver:cap-analysis/dev 14/34] net/sched/act_api.c:66 tcf_set_action_cookie() error: uninitialized symbol 'old'.

[melver:cap-analysis/dev 14/34] net/sched/act_api.c:66 tcf_set_action_cookie() error: uninitialized symbol 'old'.

[kernel test robot]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: elver@google.com

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/melver/linux.git cap-analysis/dev
head:   4402c229e926bc7daad98d65e55297b090302dac
commit: 706499ce0fa57b3087c860c2595c9b7699dd4946 [14/34] rcu: Support Clang's capability analysis
:::::: branch date: 17 hours ago
:::::: commit date: 17 hours ago
config: x86_64-randconfig-161-20250807 (https://download.01.org/0day-ci/archive/20250807/202508071401.PJIfqLEX-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202508071401.PJIfqLEX-lkp@intel.com/

smatch warnings:
net/sched/act_api.c:66 tcf_set_action_cookie() error: uninitialized symbol 'old'.

vim +/old +66 net/sched/act_api.c

eec94fdb048067 Vlad Buslov  2018-07-05  59  
eec94fdb048067 Vlad Buslov  2018-07-05  60  static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
eec94fdb048067 Vlad Buslov  2018-07-05  61  				  struct tc_cookie *new_cookie)
eec94fdb048067 Vlad Buslov  2018-07-05  62  {
eec94fdb048067 Vlad Buslov  2018-07-05  63  	struct tc_cookie *old;
eec94fdb048067 Vlad Buslov  2018-07-05  64  
b4cb4a1391dcdc Eric Dumazet 2024-06-04  65  	old = unrcu_pointer(xchg(old_cookie, RCU_INITIALIZER(new_cookie)));
eec94fdb048067 Vlad Buslov  2018-07-05 @66  	if (old)
eec94fdb048067 Vlad Buslov  2018-07-05  67  		call_rcu(&old->rcu, tcf_free_cookie_rcu);
eec94fdb048067 Vlad Buslov  2018-07-05  68  }
eec94fdb048067 Vlad Buslov  2018-07-05  69  

:::::: The code at line 66 was first introduced by commit
:::::: eec94fdb04806790c7b7e6ea347820064cc6d467 net: sched: use rcu for action cookie update

:::::: TO: Vlad Buslov <vladbu@mellanox.com>
:::::: CC: David S. Miller <davem@davemloft.net>

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