tree fa1ac845eabceecfb82f35b92ad3ef193633e338
parent 661967b7623b88985bdd3aeb171feb83d753aea9
author Dmitry Torokhov <dmitry.torokhov@gmail.com> 1576277776 -0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1579028667 +0100

Input: add safety guards to input_set_keycode()

commit cb222aed03d798fc074be55e59d9a112338ee784 upstream.

If we happen to have a garbage in input device's keycode table with values
too big we'll end up doing clear_bit() with offset way outside of our
bitmaps, damaging other objects within an input device or even outside of
it. Let's add sanity checks to the returned old keycodes.

Reported-by: syzbot+c769968809f9359b07aa@syzkaller.appspotmail.com
Reported-by: syzbot+76f3a30e88d256644c78@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20191207212757.GA245964@dtor-ws
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>