linux-kernel - Re: [PATCH] Bluetooth: hci

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Message-ID: <CAEg-Je-SvvMpAAqtOPgaKt1PuoZi37K0Tprf3KDts-SBTzNpUA@mail.gmail.com>
Date:   Tue, 14 Nov 2023 10:13:43 -0500
From:   Neal Gompa <neal@...pa.dev>
To:     Hector Martin <marcan@...can.st>
Cc:     Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Aditya Garg <gargaditya08@...e.com>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: hci_bcm4377: Fix msgid release

On Tue, Nov 14, 2023 at 2:05 AM Hector Martin <marcan@...can.st> wrote:
>
> We are releasing a single msgid, so the order argument to
> bitmap_release_region must be zero.
>
> In practice this was probably harmlessly masked to 0 anyway, which is
> why it worked, but it trips ubsan.
>
> Fixes: 8a06127602de ("Bluetooth: hci_bcm4377: Add new driver for BCM4377 PCIe boards")
> Reported-by: Aditya Garg <gargaditya08@...e.com>
> Cc: stable@...r.kernel.org
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>  drivers/bluetooth/hci_bcm4377.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/bluetooth/hci_bcm4377.c b/drivers/bluetooth/hci_bcm4377.c
> index 19ad0e788646..5e9f79235cde 100644
> --- a/drivers/bluetooth/hci_bcm4377.c
> +++ b/drivers/bluetooth/hci_bcm4377.c
> @@ -715,7 +715,7 @@ static void bcm4377_handle_ack(struct bcm4377_data *bcm4377,
>                 ring->events[msgid] = NULL;
>         }
>
> -       bitmap_release_region(ring->msgids, msgid, ring->n_entries);
> +       bitmap_release_region(ring->msgids, msgid, 0);
>
>  unlock:
>         spin_unlock_irqrestore(&ring->lock, flags);
>
> ---
> base-commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa
> change-id: 20231114-bluetooth-msgid-fix-29769be7e45b
>
> Best regards,
> --
> Hector Martin <marcan@...can.st>
>
>

LGTM.

Reviewed-by: Neal Gompa <neal@...pa.dev>


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