HID: playstation: validate num_touch_reports in DualShock 4 reports

HID: playstation: validate num_touch_reports in DualShock 4 reports

The DualShock 4 HID driver fails to validate the num_touch_reports field
received from the device in both USB and Bluetooth input reports.
A malicious device could set this field to a value larger than the
allocated size of the touch_reports array (3 for USB, 4 for Bluetooth),
leading to an out-of-bounds read in dualshock4_parse_report().

This can result in kernel memory disclosure when processing malicious
HID reports.

Validate num_touch_reports against the array size for the respective
connection types before processing the touch data.

Signed-off-by: Benoît Sevens <bsevens@google.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>