Hello:

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

On Tue,  8 Mar 2022 16:12:23 +0800 you wrote:

When two ax25 devices attempted to establish connection, the requester use ax25_create(),
ax25_bind() and ax25_connect() to initiate connection. The receiver use ax25_rcv() to
accept connection and use ax25_create_cb() in ax25_rcv() to create ax25_cb, but the
ax25_cb->sk is NULL. When the receiver is detaching, a NULL pointer dereference bug
caused by sock_hold(sk) in ax25_kill_by_device() will happen. The corresponding
fail log is shown below:

[...]

Here is the summary with links:
  - ax25: Fix NULL pointer dereference in ax25_kill_by_device
    https://git.kernel.org/netdev/net/c/71171ac8eb34

You are awesome, thank you!
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