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tty: USB: serial/mct_u232, fix tty refcnt

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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 <jirislaby@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jiri Slaby 2009-09-06 23:10:10 +02:00 committed by Live-CD User
parent 7e63d0c453
commit 054f2346cb
1 changed files with 6 additions and 3 deletions
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7
drivers/usb/serial/mct_u232.c
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@ -566,10 +566,13 @@ static void mct_u232_read_int_callback(struct urb *urb)
* Work-a-round: handle the 'usual' bulk-in pipe here * Work-a-round: handle the 'usual' bulk-in pipe here
*/ */
if (urb->transfer_buffer_length > 2) { if (urb->transfer_buffer_length > 2) {
tty = tty_port_tty_get(&port->port);
if (urb->actual_length) { if (urb->actual_length) {
tty_insert_flip_string(tty, data, urb->actual_length); tty = tty_port_tty_get(&port->port);
if (tty) {
tty_insert_flip_string(tty, data,
urb->actual_length);
tty_flip_buffer_push(tty); tty_flip_buffer_push(tty);
}
tty_kref_put(tty); tty_kref_put(tty);
} }
goto exit; goto exit;