Re: [PATCH] Bluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()

[patchwork-bot+bluetooth]

Hello:

This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>:

On Fri,  4 Sep 2026 12:24:22 +0000 (UTC) you wrote:
> From: Krystian Kaniewski <krystianmkaniewski@xxxxxxxxx>
> 
> A NULL pointer dereference in klist_put() occurs when a child device (such
> as a BNEP network device in bnep_session) is concurrently being
> unregistered while hci_conn_del_sysfs() reparents child devices.
> 
> This is caused by a race condition between hci_conn_del_sysfs() and
> concurrent child device unregistration (e.g. bnep_session calling
> unregister_netdev()). During device unregistration, device_del() snapshots
> a non-NULL parent pointer. Concurrently, hci_conn_del_sysfs() finds the
> child device using device_find_any_child() and calls device_move() to
> reparent it to NULL, which removes the node from its parent's klist and
> clears knode_parent. Subsequently, device_del() calls
> klist_del(&dev->p->knode_parent) using the stale parent snapshot, causing
> klist_put() to dereference knode_klist(n)->put on an already removed node,
> resulting in a NULL pointer dereference.
> 
> [...]

Here is the summary with links:
  - Bluetooth: hci_sysfs: Fix NULL pointer dereference in device_del()
    https://git.kernel.org/bluetooth/bluetooth-next/c/21c3501e5f46

You are awesome, thank you!
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