This is a note to let you know that I've just added the patch titled
Bluetooth: bfusb: fix division by zero in send path
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bluetooth-bfusb-fix-division-by-zero-in-send-path.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b5e6fa7a12572c82f1e7f2f51fbb02a322291291 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@xxxxxxxxxx>
Date: Mon, 25 Oct 2021 13:39:44 +0200
Subject: Bluetooth: bfusb: fix division by zero in send path
From: Johan Hovold <johan@xxxxxxxxxx>
commit b5e6fa7a12572c82f1e7f2f51fbb02a322291291 upstream.
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@xxxxxxxxxxxxxxx
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/bluetooth/bfusb.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/bluetooth/bfusb.c
+++ b/drivers/bluetooth/bfusb.c
@@ -628,6 +628,9 @@ static int bfusb_probe(struct usb_interf
data->bulk_out_ep = bulk_out_ep->desc.bEndpointAddress;
data->bulk_pkt_size = le16_to_cpu(bulk_out_ep->desc.wMaxPacketSize);
+ if (!data->bulk_pkt_size)
+ goto done;
+
rwlock_init(&data->lock);
data->reassembly = NULL;
Patches currently in stable-queue which might be from johan@xxxxxxxxxx are
queue-5.16/bluetooth-bfusb-fix-division-by-zero-in-send-path.patch
