From: Johan Hovold <jhovold@xxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
commit 8452727de70f6ad850cd6d0aaa18b5d9050aa63b upstream.
Fix use after free or NULL-pointer dereference during suspend and
resume.
The port data may never have been allocated (port probe failed)
or may already have been released by port_remove (e.g. driver is
unloaded) when suspend and resume are called.
Fixes: e6929a9020ac ("USB: support for autosuspend in sierra while
online")
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/usb/serial/sierra.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index b3f2b60465bd..efdb76a7b787 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -941,6 +941,7 @@ static int sierra_port_remove(struct usb_serial_port *port)
struct sierra_port_private *portdata;
portdata = usb_get_serial_port_data(port);
+ usb_set_serial_port_data(port, NULL);
kfree(portdata);
return 0;
@@ -957,6 +958,8 @@ static void stop_read_write_urbs(struct usb_serial *serial)
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
portdata = usb_get_serial_port_data(port);
+ if (!portdata)
+ continue;
sierra_stop_rx_urbs(port);
usb_kill_anchored_urbs(&portdata->active);
}
@@ -999,6 +1002,9 @@ static int sierra_resume(struct usb_serial *serial)
port = serial->port[i];
portdata = usb_get_serial_port_data(port);
+ if (!portdata)
+ continue;
+
while ((urb = usb_get_from_anchor(&portdata->delayed))) {
usb_anchor_urb(urb, &portdata->active);
intfdata->in_flight++;
--
2.0.0
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