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| author | Johan Hovold <johan@kernel.org> | 2021-10-25 13:39:44 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-16 09:12:43 +0100 |
| commit | 402aff59a748297ab4e9fa45c0e9948639ebfddb (patch) | |
| tree | 5ba5981665a2531774e0e5ff616f3bc2640bc67b /drivers/bluetooth | |
| parent | db74ee79c9f7e9042f1dba8aa97ca134f60b56e2 (diff) | |
| download | linux-stable-402aff59a748297ab4e9fa45c0e9948639ebfddb.tar.gz linux-stable-402aff59a748297ab4e9fa45c0e9948639ebfddb.tar.bz2 linux-stable-402aff59a748297ab4e9fa45c0e9948639ebfddb.zip | |
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 <johan@kernel.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/bluetooth')
| -rw-r--r-- | drivers/bluetooth/bfusb.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/bluetooth/bfusb.c b/drivers/bluetooth/bfusb.c index 5a321b4076aa..cab93935cc7f 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; |