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USB: serial: keyspan: handle unbound ports 

commit 3018dd3fa114b13261e9599ddb5656ef97a1fa17 upstream.

Check for NULL port data in the control URB completion handlers to avoid
dereferencing a NULL pointer in the unlikely case where a port device
isn't bound to a driver (e.g. after an allocation failure on port
probe()).

Fixes: 0ca1268e10 ("USB Serial Keyspan: add support for USA-49WG & USA-28XG")
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2020-01-17 10:50:25 +01:00 committed by Greg Kroah-Hartman
parent 04f4a098d2
commit cc35854f2e
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/serial/keyspan.c
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@ -1058,6 +1058,8 @@ static void usa49_glocont_callback(struct urb *urb)
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
p_priv = usb_get_serial_port_data(port);
if (!p_priv)
continue;
if (p_priv->resend_cont) {
dev_dbg(&port->dev, "%s - sending setup\n", __func__);
@ -1459,6 +1461,8 @@ static void usa67_glocont_callback(struct urb *urb)
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
p_priv = usb_get_serial_port_data(port);
if (!p_priv)
continue;
if (p_priv->resend_cont) {
dev_dbg(&port->dev, "%s - sending setup\n", __func__);