From: "Michael S. Tsirkin" <m...@redhat.com>
commit 10e7ac22cdd4d211cef99afcb9371b70cb175be6 upstream.
Calling return copy_to_user(...) in an ioctl will not do the right thing
if there's a pagefault: copy_to_user returns the number of bytes not
copied in this case.
Fix up watchdog/rc32434_wdt to do
return copy_to_user(...)) ? -EFAULT : 0;
instead.
Cc: sta...@vger.kernel.org
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Guenter Roeck <li...@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <w...@iguana.be>
Signed-off-by: Willy Tarreau <w...@1wt.eu>
---
drivers/watchdog/rc32434_wdt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/watchdog/rc32434_wdt.c b/drivers/watchdog/rc32434_wdt.c
index f78bc00..ea8f582 100644
--- a/drivers/watchdog/rc32434_wdt.c
+++ b/drivers/watchdog/rc32434_wdt.c
@@ -237,7 +237,7 @@ static long rc32434_wdt_ioctl(struct file *file, unsigned
int cmd,
return -EINVAL;
/* Fall through */
case WDIOC_GETTIMEOUT:
- return copy_to_user(argp, &timeout, sizeof(int));
+ return copy_to_user(argp, &timeout, sizeof(int)) ? -EFAULT : 0;
default:
return -ENOTTY;
}
--
2.8.0.rc2.1.gbe9624a
