Re: [PATCH net] net/sched: act_api: fix TOCTOU NULL deref on a->goto_chain

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <[email protected]>:

On Sun,  9 Aug 2026 05:09:28 -0400 you wrote:
> tcf_action_exec() handles TC_ACT_GOTO_CHAIN by first checking
> rcu_access_pointer(a->goto_chain) and then calling
> tcf_action_goto_chain_exec(), which does a second, independent
> rcu_dereference_bh(a->goto_chain) read and immediately dereferences
> chain->filter_chain. A concurrent tcf_action_set_ctrlact() (e.g. the gact
> replace path) can clear a->goto_chain between the two reads, so the second
> read returns NULL and tcf_action_goto_chain_exec() dereferences NULL.
> 
> [...]

Here is the summary with links:
  - [net] net/sched: act_api: fix TOCTOU NULL deref on a->goto_chain
    https://git.kernel.org/netdev/net/c/f60b396ee174

You are awesome, thank you!
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