tty: double unlock on error in ptmx_open()

The problem here is that we called mutex_unlock(&devpts_mutex) on the
error path when we weren't holding the lock.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index d8558834ce57..a0ca0830cbcf 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -618,13 +618,12 @@ static int ptmx_open(struct inode *inode, struct file *filp)
         /* find a device that is not in use. */
         mutex_lock(&devpts_mutex);
         index = devpts_new_index(inode);
+        mutex_unlock(&devpts_mutex);
         if (index < 0) {
                 retval = index;
                 goto err_file;
         }
 
-        mutex_unlock(&devpts_mutex);
-
         mutex_lock(&tty_mutex);
         tty = tty_init_dev(ptm_driver, index);
 
@@ -659,7 +658,6 @@ out:
         mutex_unlock(&tty_mutex);
         devpts_kill_index(inode, index);
 err_file:
-        mutex_unlock(&devpts_mutex);
         tty_free_file(filp);
         return retval;
 }