staging: alarm-dev: information leak in alarm_ioctl()

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>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/android/alarm-dev.c b/drivers/staging/android/alarm-dev.c
index ceb1c643753d9fef288d7d5eda97b5191b7726a7..c8600d96b9dff85c676dca09ff06f5b30c6f9bbc 100644 (file)
--- 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,