Hello:

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

On Tue,  8 Feb 2022 23:40:00 +0800 you wrote:

The ax25_disconnect() in ax25_kill_by_device() is not
protected by any locks, thus there is a race condition
between ax25_disconnect() and ax25_destroy_socket().
when ax25->sk is assigned as NULL by ax25_destroy_socket(),
a NULL pointer dereference bug will occur if site (1) or (2)
dereferences ax25->sk.

[...]

Here is the summary with links:
  - ax25: fix NPD bug in ax25_disconnect
    https://git.kernel.org/netdev/net/c/7ec02f5ac8a5

You are awesome, thank you!
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