[patch] staging: alarm-dev: information leak in alarm_ioctl()

[Dan Carpenter <dan.carpenter@oracle.com>]

Smatch complains that if we pass an invalid clock type then "ts" is
never set.  We need to check for errors earlier, otherwise we end up
passing uninitialized stack data to userspace.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/staging/android/alarm-dev.c b/drivers/staging/android/alarm-dev.c
index ceb1c643..c8600d9 100644
--- a/drivers/staging/android/alarm-dev.c
+++ b/drivers/staging/android/alarm-dev.c
@@ -264,6 +264,8 @@ static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	}
 
 	rv = alarm_do_ioctl(file, cmd, &ts);
+	if (rv)
+		return rv;
 
 	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
 	case ANDROID_ALARM_GET_TIME(0):
@@ -272,7 +274,7 @@ static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		break;
 	}
 
-	return rv;
+	return 0;
 }
 #ifdef CONFIG_COMPAT
 static long alarm_compat_ioctl(struct file *file, unsigned int cmd,