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USB: hub: fix SS max number of ports

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Add define for the maximum number of ports on a SuperSpeed hub as per
USB 3.1 spec Table 10-5, and use it when verifying the retrieved hub
descriptor.

This specifically avoids benign attempts to update the DeviceRemovable
mask for non-existing ports (should we get that far).

Fixes: dbe79bbe9d ("USB 3.0 Hub Changes")
Acked-by: Alan Stern <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Johan Hovold 2017-05-10 18:18:29 +02:00 • committed by Greg Kroah-Hartman
commit 93491ced3c
2 changed files with 10 additions and 1 deletions
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8
drivers/usb/core/hub.c
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@ -1336,7 +1336,13 @@ static int hub_configure(struct usb_hub *hub,
if (ret < 0) {
message = "can't read hub descriptor";
goto fail;
} else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
}
maxchild = USB_MAXCHILDREN;
if (hub_is_superspeed(hdev))
maxchild = min_t(unsigned, maxchild, USB_SS_MAXPORTS);
if (hub->descriptor->bNbrPorts > maxchild) {
message = "hub has too many ports!";
ret = -ENODEV;
goto fail;