linux-kernel - Re: [PATCH] Bluetooth: hci_qca: Fix crash with non-serdev devices

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Message-Id: <5BD8642B-7178-431B-B851-68E374752751@holtmann.org>
Date:   Tue, 23 Apr 2019 21:38:36 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        Hemantg <hemantg@...eaurora.org>,
        Rocky Liao <rjliao@...eaurora.org>
Subject: Re: [PATCH] Bluetooth: hci_qca: Fix crash with non-serdev devices

Hi Matthias,

> qca_set_baudrate() calls serdev_device_wait_until_sent() assuming that
> the HCI is always associated with a serdev device. This isn't true for
> ROME controllers instantiated through ldisc, where the call causes a
> crash due to a NULL pointer dereferentiation. Only call the function
> when we have a serdev device. The timeout for ROME devices at the end
> of qca_set_baudrate() is long enough to be reasonably sure that the
> command was sent.
> 
> Fixes: fa9ad876b8e0 ("Bluetooth: hci_qca: Add support for Qualcomm Bluetooth chip wcn3990")
> Reported-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
> Reported-by: Rocky Liao <rjliao@...eaurora.org>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> Reviewed-by: Rocky Liao <rjliao@...eaurora.org>
> Tested-by: Rocky Liao <rjliao@...eaurora.org>
> Reviewed-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
> ---
> Changes in v2:
> - first version got corrupted for some reason, this should apply
> - added 'Reviewed-by' tags from Rocky abd Balakrishna
> - added 'Tested-by' tag from Rocky
> ---
> drivers/bluetooth/hci_qca.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel