https://github.com/torvalds/linux
Revision 510cccb5b0c8868a2b302a0ab524da7912da648b authored by Dmitry Torokhov on 27 June 2016, 21:12:34 UTC, committed by Dmitry Torokhov on 21 July 2016, 00:50:23 UTC
The size of individual keymap in drivers/tty/vt/keyboard.c is NR_KEYS,
which is currently 256, whereas number of keys/buttons in input device (and
therefor in key_down) is much larger - KEY_CNT - 768, and that can cause
out-of-bound access when we do

	sym = U(key_maps[0][k]);

with large 'k'.

To fix it we should not attempt iterating beyond smaller of NR_KEYS and
KEY_CNT.

Also while at it let's switch to for_each_set_bit() instead of open-coding
it.

Reported-by: Sasha Levin <sasha.levin@oracle.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
1 parent e4add7b
History
Tip revision: 510cccb5b0c8868a2b302a0ab524da7912da648b authored by Dmitry Torokhov on 27 June 2016, 21:12:34 UTC
tty/vt/keyboard: fix OOB access in do_compute_shiftstate()
Tip revision: 510cccb

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