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Commit bf61f8d3 authored by Kenichi Nagai's avatar Kenichi Nagai Committed by Linus Torvalds
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Input: evdev - fix overflow in compat_ioctl 



When exporting input device bitmaps via compat_ioctl on BIG_ENDIAN
platforms evdev calculates data size incorrectly. This causes buffer
overflow if user specifies buffer smaller than maxlen.

Signed-off-by: default avatarKenichi Nagai <kenichi3.nagai@toshiba.co.jp>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 435b71be

drivers/input/evdev.c

+1 −1
Original line number Diff line number Diff line
@@ -336,7 +336,7 @@ static int bits_to_user(unsigned long *bits, unsigned int maxbit, 


	if (compat) {

		len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);

		if (len < maxlen)

		if (len > maxlen)

			len = maxlen;



		for (i = 0; i < len / sizeof(compat_long_t); i++)