This is a note to let you know that I've just added the patch titled
USB: serial: mxuport: fix use-after-free in probe error path
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-next branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will also be merged in the next major kernel release
during the merge window.
If you have any questions about this process, please let me know.
>From 9e45284984096314994777f27e1446dfbfd2f0d7 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@xxxxxxxxxx>
Date: Sun, 8 May 2016 20:08:01 +0200
Subject: USB: serial: mxuport: fix use-after-free in probe error path
The interface read and event URBs are submitted in attach, but were
never explicitly unlinked by the driver. Instead the URBs would have
been killed by usb-serial core on disconnect.
In case of a late probe error (e.g. due to failed minor allocation),
disconnect is never called and we could end up with active URBs for an
unbound interface. This in turn could lead to deallocated memory being
dereferenced in the completion callbacks.
Fixes: ee467a1f2066 ("USB: serial: add Moxa UPORT 12XX/14XX/16XX
driver")
Cc: stable <stable@xxxxxxxxxxxxxxx> # v3.14
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/serial/mxuport.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/usb/serial/mxuport.c b/drivers/usb/serial/mxuport.c
index 31a8b47f1ac6..c6596cbcc4b6 100644
--- a/drivers/usb/serial/mxuport.c
+++ b/drivers/usb/serial/mxuport.c
@@ -1259,6 +1259,15 @@ static int mxuport_attach(struct usb_serial *serial)
return 0;
}
+static void mxuport_release(struct usb_serial *serial)
+{
+ struct usb_serial_port *port0 = serial->port[0];
+ struct usb_serial_port *port1 = serial->port[1];
+
+ usb_serial_generic_close(port1);
+ usb_serial_generic_close(port0);
+}
+
static int mxuport_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct mxuport_port *mxport = usb_get_serial_port_data(port);
@@ -1361,6 +1370,7 @@ static struct usb_serial_driver mxuport_device = {
.probe = mxuport_probe,
.port_probe = mxuport_port_probe,
.attach = mxuport_attach,
+ .release = mxuport_release,
.calc_num_ports = mxuport_calc_num_ports,
.open = mxuport_open,
.close = mxuport_close,
--
2.8.2
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