Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller [off-list ref]:

On Fri, 22 Dec 2023 01:13:59 +0000 you wrote:

The freeing and re-allocation of algorithm are protected by cpool_mutex,
so it doesn't fix an actual use-after-free, but avoids a deserved
refcount_warn_saturate() warning.

A trivial fix for the racy behavior.

Fixes: 8c73b26315aa ("net/tcp: Prepare tcp_md5sig_pool for TCP-AO")
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Dmitry Safonov <redacted>

[...]

Here is the summary with links:
  - net/tcp_sigpool: Use kref_get_unless_zero()
    https://git.kernel.org/netdev/net/c/b901a4e27694

You are awesome, thank you!
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