From c2f38a34645bef1c6475dcacbc51c038fd081cfc Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Mon, 31 Jan 2011 10:56:37 -0500 Subject: [PATCH] USB: prevent buggy hubs from crashing the USB stack commit d199c96d41d80a567493e12b8e96ea056a1350c1 upstream. If anyone comes across a high-speed hub that (by mistake or by design) claims to have no Transaction Translators, plugging a full- or low-speed device into it will cause the USB stack to crash. This patch (as1446) prevents the problem by ignoring such devices, since the kernel has no way to communicate with them. Signed-off-by: Alan Stern Tested-by: Perry Neben Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 566c1833f1695..4b7e04b4d22d6 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2722,6 +2722,11 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, udev->ttport = hdev->ttport; } else if (udev->speed != USB_SPEED_HIGH && hdev->speed == USB_SPEED_HIGH) { + if (!hub->tt.hub) { + dev_err(&udev->dev, "parent hub has no TT\n"); + retval = -EINVAL; + goto fail; + } udev->tt = &hub->tt; udev->ttport = port1; } -- 2.47.2