]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
Bluetooth: bfusb: fix division by zero in send path
authorJohan Hovold <johan@kernel.org>
Mon, 25 Oct 2021 11:39:44 +0000 (13:39 +0200)
committerMarcel Holtmann <marcel@holtmann.org>
Mon, 25 Oct 2021 13:04:46 +0000 (15:04 +0200)
commitb5e6fa7a12572c82f1e7f2f51fbb02a322291291
treeb39ea983b2b7fae7681d31d417373b27d416cc78
parent2a7ca7459d905febf519163bd9e3eed894de6bb7
Bluetooth: bfusb: fix division by zero in send path

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>
drivers/bluetooth/bfusb.c