linux-kernel - [PATCH 3.2 07/95] USB: serial: io_ti: fix NULL-deref in interrupt callback

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Message-ID: <lsq.1500213398.33955768@decadent.org.uk>
Date:   Sun, 16 Jul 2017 14:56:38 +0100
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 07/95] USB: serial: io_ti: fix NULL-deref in interrupt
 callback

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

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

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

commit 0b1d250afb8eb9d65afb568bac9b9f9253a82b49 upstream.

Fix a NULL-pointer dereference in the interrupt callback should a
malicious device send data containing a bad port number by adding the
missing sanity check.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@...nel.org>
[bwh: Backported to 3.2:
 - Use &urb->dev->dev instead of local dev variable
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/serial/io_ti.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -1681,6 +1681,12 @@ static void edge_interrupt_callback(stru
 	function    = TIUMP_GET_FUNC_FROM_CODE(data[0]);
 	dbg("%s - port_number %d, function %d, info 0x%x",
 	     __func__, port_number, function, data[1]);
+
+	if (port_number >= edge_serial->serial->num_ports) {
+		dev_err(&urb->dev->dev, "bad port number %d\n", port_number);
+		goto exit;
+	}
+
 	port = edge_serial->serial->port[port_number];
 	edge_port = usb_get_serial_port_data(port);
 	if (!edge_port) {