tree cb19655e11b5f8113b444b5685ffc5b9372d5046
parent bce1305c0ece3dc549663605e567655dd701752c
author Marc Zyngier <maz@kernel.org> 1598953953 +0100
committer Benjamin Tissoires <benjamin.tissoires@gmail.com> 1598954801 +0200

HID: core: Sanitize event code and type when mapping input

When calling into hid_map_usage(), the passed event code is
blindly stored as is, even if it doesn't fit in the associated bitmap.

This event code can come from a variety of sources, including devices
masquerading as input devices, only a bit more "programmable".

Instead of taking the event code at face value, check that it actually
fits the corresponding bitmap, and if it doesn't:
- spit out a warning so that we know which device is acting up
- NULLify the bitmap pointer so that we catch unexpected uses

Code paths that can make use of untrusted inputs can now check
that the mapping was indeed correct and bail out if not.

Cc: stable@vger.kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>