linux-kernel - [PATCH] drivers: staging: ft1000: ft1000-usb: ft1000_debug.c: check return value of get_user() in ft1000

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Date:	Wed, 27 Nov 2013 11:40:58 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	marek.belisko@...il.com, katjacollier@...il.com,
	linux@...nbow-software.org, Al Viro <viro@...iv.linux.org.uk>
CC:	rkuo <rkuo@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>
Subject: [PATCH] drivers: staging: ft1000: ft1000-usb: ft1000_debug.c: check
 return value of get_user() in ft1000_ioctl()

get_user() may fail and cause 'msgsz' uninitialized, so need give a
check. The related warning (with allmodconfig under hexagon):

    CC [M]  drivers/staging/ft1000/ft1000-usb/ft1000_debug.o
  drivers/staging/ft1000/ft1000-usb/ft1000_debug.c: In function 'ft1000_ioctl':
  include/uapi/linux/swab.h:53:9: warning: 'msgsz' may be used uninitialized in this function [-Wuninitialized]
  drivers/staging/ft1000/ft1000-usb/ft1000_debug.c:533:17: note: 'msgsz' was declared here
 

Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
---
 drivers/staging/ft1000/ft1000-usb/ft1000_debug.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/ft1000/ft1000-usb/ft1000_debug.c b/drivers/staging/ft1000/ft1000-usb/ft1000_debug.c
index 68a55ce..ffdc7f5 100644
--- a/drivers/staging/ft1000/ft1000-usb/ft1000_debug.c
+++ b/drivers/staging/ft1000/ft1000-usb/ft1000_debug.c
@@ -560,6 +560,8 @@ static long ft1000_ioctl(struct file *file, unsigned int command,
 
                 /* Get the length field to see how many bytes to copy */
                 result = get_user(msgsz, (__u16 __user *)argp);
+		if (result)
+			break;
                 msgsz = ntohs(msgsz);
                 /* DEBUG("FT1000:ft1000_ioctl: length of message = %d\n", msgsz); */
 
-- 
1.7.7.6
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