tree 69719f3d0c6436c8d4a21e506872dede9374f5be
parent a0312af1f94d13800e63a7d0a66e563582e39aec
author Will McVicker <willmcvicker@google.com> 1607129328 +0000
committer Jiri Kosina <jkosina@suse.cz> 1610957397 +0100

HID: make arrays usage and value to be the same

The HID subsystem allows an "HID report field" to have a different
number of "values" and "usages" when it is allocated. When a field
struct is created, the size of the usage array is guaranteed to be at
least as large as the values array, but it may be larger. This leads to
a potential out-of-bounds write in
__hidinput_change_resolution_multipliers() and an out-of-bounds read in
hidinput_count_leds().

To fix this, let's make sure that both the usage and value arrays are
the same size.

Cc: stable@vger.kernel.org
Signed-off-by: Will McVicker <willmcvicker@google.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>