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authorMichael S. Tsirkin <mst@redhat.com>2016-02-28 18:44:09 +0300
committerWim Van Sebroeck <wim@iguana.be>2016-03-01 17:29:42 +0300
commit10e7ac22cdd4d211cef99afcb9371b70cb175be6 (patch)
treebf9e63aa2829e06b7ac29d125d7db8712ae850fd /drivers/watchdog
parent972ec3510330c9d639c0dd72960e9aa02915855c (diff)
downloadlinux-10e7ac22cdd4d211cef99afcb9371b70cb175be6.tar.xz
watchdog: rc32434_wdt: fix ioctl error handling
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: stable@vger.kernel.org Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/rc32434_wdt.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/watchdog/rc32434_wdt.c b/drivers/watchdog/rc32434_wdt.c
index 71e78ef4b736..3a75f3b53452 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;
}