From aa93d1fee85c890a34f2510a310e55ee76a27848 Mon Sep 17 00:00:00 2001 From: James Patrick-Evans Date: Fri, 15 Jul 2016 16:40:45 +0100 Subject: [PATCH] media: fix airspy usb probe error path Fix a memory leak on probe error of the airspy usb device driver. The problem is triggered when more than 64 usb devices register with v4l2 of type VFL_TYPE_SDR or VFL_TYPE_SUBDEV. The memory leak is caused by the probe function of the airspy driver mishandeling errors and not freeing the corresponding control structures when an error occours registering the device to v4l2 core. A badusb device can emulate 64 of these devices, and then through continual emulated connect/disconnect of the 65th device, cause the kernel to run out of RAM and crash the kernel, thus causing a local DOS vulnerability. Fixes CVE-2016-5400 Signed-off-by: James Patrick-Evans Reviewed-by: Kees Cook Cc: stable@vger.kernel.org # 3.17+ Signed-off-by: Linus Torvalds --- drivers/media/usb/airspy/airspy.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/media/usb/airspy/airspy.c b/drivers/media/usb/airspy/airspy.c index 87c12930416f..92d9d4214c3a 100644 --- a/drivers/media/usb/airspy/airspy.c +++ b/drivers/media/usb/airspy/airspy.c @@ -1072,7 +1072,7 @@ static int airspy_probe(struct usb_interface *intf, if (ret) { dev_err(s->dev, "Failed to register as video device (%d)\n", ret); - goto err_unregister_v4l2_dev; + goto err_free_controls; } dev_info(s->dev, "Registered as %s\n", video_device_node_name(&s->vdev)); @@ -1081,7 +1081,6 @@ static int airspy_probe(struct usb_interface *intf, err_free_controls: v4l2_ctrl_handler_free(&s->hdl); -err_unregister_v4l2_dev: v4l2_device_unregister(&s->v4l2_dev); err_free_mem: kfree(s); -- 2.20.1