From bf61f8d357e5d71d74a3ca3be3cce52bf1a2c01a Mon Sep 17 00:00:00 2001 From: Kenichi Nagai Date: Fri, 11 May 2007 01:12:15 -0400 Subject: [PATCH] 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: Kenichi Nagai Signed-off-by: Dmitry Torokhov Signed-off-by: Linus Torvalds --- drivers/input/evdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index 55a72592704..b234729706b 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -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++) -- 2.41.0