From: Johan Hovold johan@kernel.org
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@vger.kernel.org Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Marcel Holtmann marcel@holtmann.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/bluetooth/bfusb.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/bluetooth/bfusb.c +++ b/drivers/bluetooth/bfusb.c @@ -644,6 +644,9 @@ 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;