Re: [PATCH net] l2tp: use refcount_inc_not_zero in l2tp_session_get_by_ifname

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Fri, 22 May 2026 22:34:23 -0400 you wrote:
> A reader in l2tp_session_get_by_ifname() can return a pointer to a
> session whose refcount has reached zero. The getter takes its
> reference with plain refcount_inc(), but every other session getter
> in the same file (l2tp_v2_session_get, l2tp_v3_session_get, and the
> corresponding _get_next variants) uses refcount_inc_not_zero()
> because the IDR/RCU lookup can race with refcount_dec_and_test() ->
> l2tp_session_free() -> kfree_rcu(). The ifname getter is the only
> outlier; the inconsistency was raised on-list after 979c017803c4
> ("l2tp: use list_del_rcu in l2tp_session_unhash").
> 
> [...]

Here is the summary with links:
  - [net] l2tp: use refcount_inc_not_zero in l2tp_session_get_by_ifname
    https://git.kernel.org/netdev/net/c/05f95729ca84

You are awesome, thank you!
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