linux-kernel - [PATCH 4.4 062/117] USB: visor: fix null-deref at probe

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Message-Id: <20160214222143.279020508@linuxfoundation.org>
Date:	Sun, 14 Feb 2016 14:21:39 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Johan Hovold <johan@...nel.org>
Subject: [PATCH 4.4 062/117] USB: visor: fix null-deref at probe

4.4-stable review patch.  If anyone has any objections, please let me know.

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

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

commit cac9b50b0d75a1d50d6c056ff65c005f3224c8e0 upstream.

Fix null-pointer dereference at probe should a (malicious) Treo device
lack the expected endpoints.

Specifically, the Treo port-setup hack was dereferencing the bulk-in and
interrupt-in urbs without first making sure they had been allocated by
core.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/serial/visor.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -544,6 +544,11 @@ static int treo_attach(struct usb_serial
 		(serial->num_interrupt_in == 0))
 		return 0;
 
+	if (serial->num_bulk_in < 2 || serial->num_interrupt_in < 2) {
+		dev_err(&serial->interface->dev, "missing endpoints\n");
+		return -ENODEV;
+	}
+
 	/*
 	* It appears that Treos and Kyoceras want to use the
 	* 1st bulk in endpoint to communicate with the 2nd bulk out endpoint,