linux-kernel - Re: [PATCH] Bluetooth: fix division by zero in send path

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Message-Id: <608F4C62-7E22-4736-B032-13F4F3BE563D@holtmann.org>
Date:   Mon, 25 Oct 2021 15:05:15 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: fix division by zero in send path

Hi Johan,

> Add the missing bulk-out endpoint sanity check to probe() to avoid
> division by zero in bfusb_send_frame() in case a malicious device has
> broken descriptors (or when doing descriptor fuzz testing).
> 
> Note that USB core will reject URBs submitted for endpoints with zero
> wMaxPacketSize but that drivers doing packet-size calculations still
> need to handle this (cf. commit 2548288b4fb0 ("USB: Fix: Don't skip
> endpoint descriptors with maxpacket=0")).
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Johan Hovold <johan@...nel.org>
> ---
> drivers/bluetooth/bfusb.c | 2 ++
> 1 file changed, 2 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel