[PATCH 3.18 146/183] USB: keyspan: fix null-deref at probe

Greg Kroah-Hartman
2015-01-25T18:22:39Z

From: Johan Hovold <johan@kernel.org>

commit b5122236bba8d7ef62153da5b55cc65d0944c61e upstream.

Fix null-pointer dereference during probe if the interface-status
completion handler is called before the individual ports have been set
up.

Fixes: f79b2d0fe81e ("USB: keyspan: fix NULL-pointer dereferences and
memory leaks")
Reported-by: Richard <richjunk@pacbell.net>
Tested-by: Richard <richjunk@pacbell.net>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/serial/keyspan.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)

--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -410,6 +410,8 @@ static void usa26_instat_callback(struct
}
port = serial->port[msg->port];
p_priv = usb_get_serial_port_data(port);
+ if (!p_priv)
+ goto resubmit;

/* Update handshaking pin state information */
old_dcd_state = p_priv->dcd_state;
@@ -420,7 +422,7 @@ static void usa26_instat_callback(struct

if (old_dcd_state != p_priv->dcd_state)
tty_port_tty_hangup(&port->port, true);
-
+resubmit:
/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err != 0)
@@ -527,6 +529,8 @@ static void usa28_instat_callback(struct
}
port = serial->port[msg->port];
p_priv = usb_get_serial_port_data(port);
+ if (!p_priv)
+ goto resubmit;

/* Update handshaking pin state information */
old_dcd_state = p_priv->dcd_state;
@@ -537,7 +541,7 @@ static void usa28_instat_callback(struct

if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
tty_port_tty_hangup(&port->port, true);
-
+resubmit:
/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err != 0)
@@ -607,6 +611,8 @@ static void usa49_instat_callback(struct
}
port = serial->port[msg->portNumber];
p_priv = usb_get_serial_port_data(port);
+ if (!p_priv)
+ goto resubmit;

/* Update handshaking pin state information */
old_dcd_state = p_priv->dcd_state;
@@ -617,7 +623,7 @@ static void usa49_instat_callback(struct

if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
tty_port_tty_hangup(&port->port, true);
-
+resubmit:
/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err != 0)
@@ -855,6 +861,8 @@ static void usa90_instat_callback(struct

port = serial->port[0];
p_priv = usb_get_serial_port_data(port);
+ if (!p_priv)
+ goto resubmit;

/* Update handshaking pin state information */
old_dcd_state = p_priv->dcd_state;
@@ -865,7 +873,7 @@ static void usa90_instat_callback(struct

if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
tty_port_tty_hangup(&port->port, true);
-
+resubmit:
/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err != 0)
@@ -926,6 +934,8 @@ static void usa67_instat_callback(struct

port = serial->port[msg->port];
p_priv = usb_get_serial_port_data(port);
+ if (!p_priv)
+ goto resubmit;

/* Update handshaking pin state information */
old_dcd_state = p_priv->dcd_state;
@@ -934,7 +944,7 @@ static void usa67_instat_callback(struct

if (old_dcd_state != p_priv->dcd_state && old_dcd_state)
tty_port_tty_hangup(&port->port, true);
-
+resubmit:
/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err != 0)