From: Johan Hovold Date: Mon, 25 Oct 2021 11:39:44 +0000 (+0200) Subject: Bluetooth: bfusb: fix division by zero in send path X-Git-Tag: accepted/tizen/unified/20230118.172025~3763 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=402aff59a748297ab4e9fa45c0e9948639ebfddb;p=platform%2Fkernel%2Flinux-rpi.git Bluetooth: bfusb: fix division by zero in send path 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 Signed-off-by: Marcel Holtmann Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/bluetooth/bfusb.c b/drivers/bluetooth/bfusb.c index 5a321b4..cab9393 100644 --- a/drivers/bluetooth/bfusb.c +++ b/drivers/bluetooth/bfusb.c @@ -628,6 +628,9 @@ static int bfusb_probe(struct usb_interface *intf, const struct usb_device_id *i 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;