Re: [PATCH v1] hamradio: remove needs_free_netdev to avoid UAF

Hello:

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

On Thu, 11 Nov 2021 22:14:02 +0800 you wrote:

The former patch "defer 6pack kfree after unregister_netdev" reorders
the kfree of two buffer after the unregister_netdev to prevent the race
condition. It also adds free_netdev() function in sixpack_close(), which
is a direct copy from the similar code in mkiss_close().

However, in sixpack driver, the flag needs_free_netdev is set to true in
sp_setup(), hence the unregister_netdev() will free the netdev
automatically. Therefore, as the sp is netdev_priv, use-after-free
occurs.

[...]

Here is the summary with links:
  - [v1] hamradio: remove needs_free_netdev to avoid UAF
    https://git.kernel.org/netdev/net/c/81b1d548d00b

You are awesome, thank you!
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