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authorAlan Stern <stern@rowland.harvard.edu>2011-01-31 15:56:37 (GMT)
committerGreg Kroah-Hartman <gregkh@suse.de>2011-02-04 00:46:06 (GMT)
commitd199c96d41d80a567493e12b8e96ea056a1350c1 (patch)
treed3a5df8eca1476e6ba950b941a69de3becf6b75d /drivers/usb
parent6d86d52a33cfe6338efd007cfcca895b18c1d84b (diff)
downloadlinux-fsl-qoriq-d199c96d41d80a567493e12b8e96ea056a1350c1.tar.xz
USB: prevent buggy hubs from crashing the USB stack
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 <stern@rowland.harvard.edu> Tested-by: Perry Neben <neben@vmware.com> CC: <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/core/hub.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 4310cc4..d041c68 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2753,6 +2753,11 @@ 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;
}