linux-kernel - [PATCH V2 3/6] mpcore_wdt: Fix WDIOC

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Date:	Tue,  5 Jul 2011 23:00:37 +0400
From:	Vitaly Kuzmichev <vkuzmichev@...sta.com>
To:	linux-arm-kernel@...ts.infradead.org,
	linux-watchdog@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Marc Zyngier <marc.zyngier@....com>,
	Wim Van Sebroeck <wim@...ana.be>
Cc:	arm@...nel.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	John Stultz <johnstul@...ibm.com>,
	Nicolas Pitre <nico@...xnic.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vitaly Kuzmichev <vkuzmichev@...sta.com>
Subject: [PATCH V2 3/6] mpcore_wdt: Fix WDIOC_SETOPTIONS handling

According to the include/linux/watchdog.h WDIOC_SETOPTIONS is
classified as 'read from device' ioctl call:
  #define WDIOC_SETOPTIONS        _IOR(WATCHDOG_IOCTL_BASE, 4, int)

However, the driver 'mpcore_wdt' performs 'copy_from_user' only if
_IOC_WRITE is set, thus the local variable 'uarg' which is used in
WDIOC_SETOPTIONS handling remains uninitialized.

The proper way to fix this is to bind WDIOC_SETOPTIONS to _IOW,
but this will break compatibility.
So adding additional condition for performing 'copy_from_user'.

Signed-off-by: Vitaly Kuzmichev <vkuzmichev@...sta.com>
---
 drivers/watchdog/mpcore_wdt.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/watchdog/mpcore_wdt.c b/drivers/watchdog/mpcore_wdt.c
index 7a3d6b2..b330a0a 100644
--- a/drivers/watchdog/mpcore_wdt.c
+++ b/drivers/watchdog/mpcore_wdt.c
@@ -240,7 +240,8 @@ static long mpcore_wdt_ioctl(struct file *file, unsigned int cmd,
 	if (_IOC_DIR(cmd) && _IOC_SIZE(cmd) > sizeof(uarg))
 		return -ENOTTY;
 
-	if (_IOC_DIR(cmd) & _IOC_WRITE) {
+	if (_IOC_DIR(cmd) & _IOC_WRITE
+			|| cmd == WDIOC_SETOPTIONS) {
 		ret = copy_from_user(&uarg, (void __user *)arg, _IOC_SIZE(cmd));
 		if (ret)
 			return -EFAULT;
-- 
1.7.3.4

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