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From: Johan Hovold <johan@kernel.org>
To: Johan Hovold <johan@kernel.org>
Cc: linux-usb@vger.kernel.org, stable <stable@vger.kernel.org>
Subject: [PATCH 3/5] USB: serial: io_edgeport: add missing active-port sanity check
Date: Fri, 17 Jan 2020 10:50:24 +0100	[thread overview]
Message-ID: <20200117095026.27655-4-johan@kernel.org> (raw)
In-Reply-To: <20200117095026.27655-1-johan@kernel.org>

The driver receives the active port number from the device, but never
made sure that the port number was valid. This could lead to a
NULL-pointer dereference or memory corruption in case a device sends
data for an invalid port.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/serial/io_edgeport.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index 0582d78bdb1d..5737add6a2a4 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -1725,7 +1725,8 @@ static void edge_break(struct tty_struct *tty, int break_state)
 static void process_rcvd_data(struct edgeport_serial *edge_serial,
 				unsigned char *buffer, __u16 bufferLength)
 {
-	struct device *dev = &edge_serial->serial->dev->dev;
+	struct usb_serial *serial = edge_serial->serial;
+	struct device *dev = &serial->dev->dev;
 	struct usb_serial_port *port;
 	struct edgeport_port *edge_port;
 	__u16 lastBufferLength;
@@ -1821,9 +1822,8 @@ static void process_rcvd_data(struct edgeport_serial *edge_serial,
 
 			/* spit this data back into the tty driver if this
 			   port is open */
-			if (rxLen) {
-				port = edge_serial->serial->port[
-							edge_serial->rxPort];
+			if (rxLen && edge_serial->rxPort < serial->num_ports) {
+				port = serial->port[edge_serial->rxPort];
 				edge_port = usb_get_serial_port_data(port);
 				if (edge_port && edge_port->open) {
 					dev_dbg(dev, "%s - Sending %d bytes to TTY for port %d\n",
@@ -1833,8 +1833,8 @@ static void process_rcvd_data(struct edgeport_serial *edge_serial,
 							rxLen);
 					edge_port->port->icount.rx += rxLen;
 				}
-				buffer += rxLen;
 			}
+			buffer += rxLen;
 			break;
 
 		case EXPECT_HDR3:	/* Expect 3rd byte of status header */
@@ -1869,6 +1869,8 @@ static void process_rcvd_status(struct edgeport_serial *edge_serial,
 	__u8 code = edge_serial->rxStatusCode;
 
 	/* switch the port pointer to the one being currently talked about */
+	if (edge_serial->rxPort >= edge_serial->serial->num_ports)
+		return;
 	port = edge_serial->serial->port[edge_serial->rxPort];
 	edge_port = usb_get_serial_port_data(port);
 	if (edge_port == NULL) {
-- 
2.24.1


  parent reply	other threads:[~2020-01-17  9:51 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-17  9:50 [PATCH 0/5] USB: serial: handle unbound ports Johan Hovold
2020-01-17  9:50 ` [PATCH 1/5] USB: ch341: handle unbound port at reset_resume Johan Hovold
2020-01-17  9:50 ` [PATCH 2/5] USB: serial: io_edgeport: handle unbound ports on URB completion Johan Hovold
2020-01-17  9:50 ` Johan Hovold [this message]
2020-01-17  9:50 ` [PATCH 4/5] USB: serial: keyspan: handle unbound ports Johan Hovold
2020-01-17  9:50 ` [PATCH 5/5] USB: serial: quatech2: " Johan Hovold
2020-01-17 10:36   ` Greg KH
2020-01-17 10:53     ` Johan Hovold
2020-01-17 13:13       ` Greg KH
2020-01-17 14:29         ` Johan Hovold
2020-01-17 13:13 ` [PATCH 0/5] USB: serial: " Greg KH

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