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From 2ea39fc263c6a7589e15edb7d2d1c89fa569be53 Mon Sep 17 00:00:00 2001
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From: Vladis Dronov <vdronov@redhat.com>
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Date: Mon, 16 Nov 2015 15:55:11 -0200
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Subject: [PATCH] usbvision: fix crash on detecting device with invalid
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configuration
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The usbvision driver crashes when a specially crafted usb device with invalid
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number of interfaces or endpoints is detected. This fix adds checks that the
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device has proper configuration expected by the driver.
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Reported-by: Ralf Spenneberg <ralf@spenneberg.net>
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Signed-off-by: Vladis Dronov <vdronov@redhat.com>
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Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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---
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drivers/media/usb/usbvision/usbvision-video.c | 16 +++++++++++++++-
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1 file changed, 15 insertions(+), 1 deletion(-)
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diff --git a/drivers/media/usb/usbvision/usbvision-video.c b/drivers/media/usb/usbvision/usbvision-video.c
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index b693206f66dd..d1dc1a198e3e 100644
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--- a/drivers/media/usb/usbvision/usbvision-video.c
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+++ b/drivers/media/usb/usbvision/usbvision-video.c
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@@ -1463,9 +1463,23 @@ static int usbvision_probe(struct usb_interface *intf,
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if (usbvision_device_data[model].interface >= 0)
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interface = &dev->actconfig->interface[usbvision_device_data[model].interface]->altsetting[0];
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- else
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+ else if (ifnum < dev->actconfig->desc.bNumInterfaces)
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interface = &dev->actconfig->interface[ifnum]->altsetting[0];
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+ else {
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+ dev_err(&intf->dev, "interface %d is invalid, max is %d\n",
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+ ifnum, dev->actconfig->desc.bNumInterfaces - 1);
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+ ret = -ENODEV;
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+ goto err_usb;
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+ }
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+
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+ if (interface->desc.bNumEndpoints < 2) {
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+ dev_err(&intf->dev, "interface %d has %d endpoints, but must"
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+ " have minimum 2\n", ifnum, interface->desc.bNumEndpoints);
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+ ret = -ENODEV;
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+ goto err_usb;
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+ }
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endpoint = &interface->endpoint[1].desc;
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+
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if (!usb_endpoint_xfer_isoc(endpoint)) {
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dev_err(&intf->dev, "%s: interface %d. has non-ISO endpoint!\n",
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__func__, ifnum);
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--
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2.5.0
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