1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 64b84291c07e..f92f4d773374 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1065,8 +1065,10 @@ static int set_serial_info(struct tty_struct *tty,
 
         if (!capable(CAP_SYS_ADMIN)) {
                 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
-                     (priv->flags & ~ASYNC_USR_MASK)))
+                     (priv->flags & ~ASYNC_USR_MASK))) {
+                        unlock_kernel();
                         return -EPERM;
+                }
                 priv->flags = ((priv->flags & ~ASYNC_USR_MASK) |
                                (new_serial.flags & ASYNC_USR_MASK));
                 priv->custom_divisor = new_serial.custom_divisor;