TTY: drop driver reference in tty_open fail path

commit c290f8358acaeffd8e0c551ddcc24d1206143376 upstream.

When tty_driver_lookup_tty fails in tty_open, we forget to drop a
reference to the tty driver. This was added by commit 4a2b5fddd5 (Move
tty lookup/reopen to caller).

Fix that by adding tty_driver_kref_put to the fail path.

I will refactor the code later. This is for the ease of backporting to
stable.

Introduced-in: v2.6.28-rc2
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Acked-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index b6f92d3001add88088f470daafde7d981f3f2a26..e9495ed8ec01f1298515cefd60ce5cc2ad505f93 100644 (file)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1872,6 +1872,7 @@ got_driver:
                if (IS_ERR(tty)) {
                        tty_unlock();
                        mutex_unlock(&tty_mutex);
+                       tty_driver_kref_put(driver);
                        return PTR_ERR(tty);
                }
        }