[PATCH v3] Bluetooth: btusb: mediatek: Avoid btusb_mtk_claim_iso_intf() NULL deref

[patchwork-bot+bluetooth at kernel.org]

Hello:

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

On Thu, 20 Nov 2025 08:12:28 -0800 you wrote:
> In btusb_mtk_setup(), we set `btmtk_data->isopkt_intf` to:
>   usb_ifnum_to_if(data->udev, MTK_ISO_IFNUM)
> 
> That function can return NULL in some cases. Even when it returns
> NULL, though, we still go on to call btusb_mtk_claim_iso_intf().
> 
> As of commit e9087e828827 ("Bluetooth: btusb: mediatek: Add locks for
> usb_driver_claim_interface()"), calling btusb_mtk_claim_iso_intf()
> when `btmtk_data->isopkt_intf` is NULL will cause a crash because
> we'll end up passing a bad pointer to device_lock(). Prior to that
> commit we'd pass the NULL pointer directly to
> usb_driver_claim_interface() which would detect it and return an
> error, which was handled.
> 
> [...]

Here is the summary with links:
  - [v3] Bluetooth: btusb: mediatek: Avoid btusb_mtk_claim_iso_intf() NULL deref
    https://git.kernel.org/bluetooth/bluetooth-next/c/dd6dda907d09

You are awesome, thank you!
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