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Input: evdev - fix overflow in compat_ioctl

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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: Kenichi Nagai <kenichi3.nagai@toshiba.co.jp>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kenichi Nagai 2007-05-11 01:12:15 -04:00 committed by Linus Torvalds
parent 435b71be20
commit bf61f8d357
1 changed files with 1 additions and 1 deletions
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2
drivers/input/evdev.c
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@ -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++)