From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jiri Slaby Subject: [PATCH 2/2] USB: serial/mct_u232, fix tty refcnt Date: Sun, 6 Sep 2009 23:10:10 +0200 Message-ID: <1252271410-26080-2-git-send-email-jirislaby@gmail.com> References: <1252271410-26080-1-git-send-email-jirislaby@gmail.com> Return-path: In-Reply-To: <1252271410-26080-1-git-send-email-jirislaby@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: gregkh@suse.de Cc: akpm@linux-foundation.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Jiri Slaby List-Id: linux-serial@vger.kernel.org Stanse found a tty refcnt leak in read_int_callback. In fact it's handled wrong altogether. tty_port_tty_get can return NULL and it's not checked in that manner. Fix that by checking the tty_port_tty_get retval and put tty kref properly. http://stanse.fi.muni.cz/ Signed-off-by: Jiri Slaby --- drivers/usb/serial/mct_u232.c | 9 ++++++--- 1 files changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c index d501aef..ad4998b 100644 --- a/drivers/usb/serial/mct_u232.c +++ b/drivers/usb/serial/mct_u232.c @@ -566,10 +566,13 @@ static void mct_u232_read_int_callback(struct urb *urb) * Work-a-round: handle the 'usual' bulk-in pipe here */ if (urb->transfer_buffer_length > 2) { - tty = tty_port_tty_get(&port->port); if (urb->actual_length) { - tty_insert_flip_string(tty, data, urb->actual_length); - tty_flip_buffer_push(tty); + tty = tty_port_tty_get(&port->port); + if (tty) { + tty_insert_flip_string(tty, data, + urb->actual_length); + tty_flip_buffer_push(tty); + } tty_kref_put(tty); } goto exit; -- 1.6.4.2