linux-kernel - [PATCH 3.2 070/199] USB: serial: io_ti: fix another NULL-deref at open

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Date:   Fri, 10 Mar 2017 11:46:10 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Johan Hovold" <johan@...nel.org>
Subject: [PATCH 3.2 070/199] USB: serial: io_ti: fix another NULL-deref at
 open

3.2.87-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>

commit 4f9785cc99feeb3673993b471f646b4dbaec2cc1 upstream.

In case a device is left in "boot-mode" we must not register any port
devices in order to avoid a NULL-pointer dereference on open due to
missing endpoints. This could be used by a malicious device to trigger
an OOPS:

Unable to handle kernel NULL pointer dereference at virtual address 00000030
...
[<bf0caa84>] (edge_open [io_ti]) from [<bf0b0118>] (serial_port_activate+0x68/0x98 [usbserial])
[<bf0b0118>] (serial_port_activate [usbserial]) from [<c0470ca4>] (tty_port_open+0x9c/0xe8)
[<c0470ca4>] (tty_port_open) from [<bf0b0da0>] (serial_open+0x48/0x6c [usbserial])
[<bf0b0da0>] (serial_open [usbserial]) from [<c0469178>] (tty_open+0xcc/0x5cc)

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@...nel.org>
[bwh: Backported to 3.2:
 - No heartbeat_work to initialise earlier
 - No separate port_probe and port_remove operations, so add check for null
   port pointers in edge_release()
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/serial/io_ti.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -1500,7 +1500,7 @@ stayinbootmode:
 	dbg("%s - STAYING IN BOOT MODE", __func__);
 	serial->product_info.TiMode = TI_MODE_BOOT;
 
-	return 0;
+	return 1;
 }
 
 
@@ -2660,11 +2660,14 @@ static int edge_startup(struct usb_seria
 	usb_set_serial_data(serial, edge_serial);
 
 	status = download_fw(edge_serial);
-	if (status) {
+	if (status < 0) {
 		kfree(edge_serial);
 		return status;
 	}
 
+	if (status > 0)
+		return 1;	/* bind but do not register any ports */
+
 	/* set up our port private structures */
 	for (i = 0; i < serial->num_ports; ++i) {
 		edge_port = kzalloc(sizeof(struct edgeport_port), GFP_KERNEL);
@@ -2715,6 +2718,8 @@ static void edge_release(struct usb_seri
 
 	for (i = 0; i < serial->num_ports; ++i) {
 		edge_port = usb_get_serial_port_data(serial->port[i]);
+		if (!edge_port)
+			continue;
 		kfifo_free(&edge_port->write_fifo);
 		kfree(edge_port);
 	}