From f8d8b7a13d3d61f99bf3dc5c9650f87f9818d7a7 Mon Sep 17 00:00:00 2001
From: "Arnaud Patard (Rtp)" <arnaud.patard@rtp-net.org>
Date: Mon, 23 Aug 2010 23:02:22 +0200
Subject: [PATCH] rt2x00: fix "buffer size not provably correct" build warning

rt2x00 debugfs interface doesn't check the size of the data coming
from userspace, leading to a build warning. Fix That.

v2: return EINVAL if input is too long

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
 drivers/net/wireless/rt2x00/rt2x00debug.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/rt2x00/rt2x00debug.c b/drivers/net/wireless/rt2x00/rt2x00debug.c
index 74f0d679883e..daf7f950a28f 100644
--- a/drivers/net/wireless/rt2x00/rt2x00debug.c
+++ b/drivers/net/wireless/rt2x00/rt2x00debug.c
@@ -480,6 +480,9 @@ static ssize_t rt2x00debug_write_##__name(struct file *file,	\
 	if (index >= debug->__name.word_count)			\
 		return -EINVAL;					\
 								\
+	if (length > sizeof(line))				\
+		return -EINVAL;					\
+								\
 	if (copy_from_user(line, buf, length))			\
 		return -EFAULT;					\
 								\
-- 
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