Re: [PATCH] Bluetooth: msft: Ignore vendor events shorter than the event prefix

[Alexey Minnekhanov]

On 10.10.2026 17:08, Adrian.Nguyen-Qualgo wrote:
> From: Adrian Nguyen <thenguyen1024@xxxxxxxxx>
>
> msft_vendor_evt() is called for every HCI vendor event. When the
> controller defines an MSFT event prefix, it pulls the prefix with
> msft_skb_pull(), which logs "Malformed MSFT vendor event" when the
> event is too short. A vendor event shorter than the prefix cannot be
> an MSFT event, though, so it is reported as malformed for nothing.
> Before commit 3368aa357f3b ("Bluetooth: msft: Handle MSFT Monitor
> Device Event") such events were dropped silently.
>
> A WCN3990 logs this 20 times at every boot, while btqca downloads its
> firmware and the controller answers each segment with a short QCA
> vendor event.
>
> Return quietly when the event is shorter than the prefix. Events that
> match the prefix but are cut short still get reported.
>
> Fixes: 3368aa357f3b ("Bluetooth: msft: Handle MSFT Monitor Device Event")
> Assisted-by: LLM
> Signed-off-by: Adrian Nguyen <thenguyen1024@xxxxxxxxx>

Hi!
I've indeed seen lots of messages like these:

 Bluetooth: hci0: Malformed MSFT vendor event: 0x00

using WCN3990 bluetooth, with this patch I see none.

Tested-by: Alexey Minnekhanov <alexeymin@xxxxxxxxxx>

--
Regards,
Alexey Minnekhanov