Bluetooth: Fix incorrect strncpy() in hidp_setup_hid()
authorAnderson Lizardo <anderson.lizardo@openbossa.org>
Sun, 6 Jan 2013 22:28:53 +0000 (18:28 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 4 Feb 2013 00:24:41 +0000 (18:24 -0600)
commit5a6d60801c24f6966cf73894258134778ddccde5
treee2ec46e0454cd0815c65a17c83c3d3ba60a43561
parent99141c253f45822edfab14fa34bfa47f56d803ad
Bluetooth: Fix incorrect strncpy() in hidp_setup_hid()

commit 0a9ab9bdb3e891762553f667066190c1d22ad62b upstream.

The length parameter should be sizeof(req->name) - 1 because there is no
guarantee that string provided by userspace will contain the trailing
'\0'.

Can be easily reproduced by manually setting req->name to 128 non-zero
bytes prior to ioctl(HIDPCONNADD) and checking the device name setup on
input subsystem:

$ cat /sys/devices/pnp0/00\:04/tty/ttyS0/hci0/hci0\:1/input8/name
AAAAAA[...]AAAAAAAAf0:af:f0:af:f0:af

("f0:af:f0:af:f0:af" is the device bluetooth address, taken from "phys"
field in struct hid_device due to overflow.)

Signed-off-by: Anderson Lizardo <anderson.lizardo@openbossa.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/bluetooth/hidp/core.c