linux-kernel - [PATCH 7/7] usb: adutux: fix misuse of return value of copy_to

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Date:	Sat, 31 Jul 2010 21:40:07 +0400
From:	Kulikov Vasiliy <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Oliver Neukum <oliver@...kum.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Joe Perches <joe@...ches.com>,
	Németh Márton <nm127@...email.hu>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 7/7] usb: adutux: fix misuse of return value of copy_to_user()

copy_to_user() returns number of not copied bytes, not error code.

Signed-off-by: Kulikov Vasiliy <segooon@...il.com>
---
 drivers/usb/misc/adutux.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/misc/adutux.c b/drivers/usb/misc/adutux.c
index d240de0..801324a 100644
--- a/drivers/usb/misc/adutux.c
+++ b/drivers/usb/misc/adutux.c
@@ -439,7 +439,7 @@ static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
 			/* drain secondary buffer */
 			int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
 			i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
-			if (i < 0) {
+			if (i) {
 				retval = -EFAULT;
 				goto exit;
 			}
-- 
1.7.0.4

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