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| author | Johan Hovold <johan@kernel.org> | 2017-05-10 18:18:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-17 11:53:02 +0200 |
| commit | 93491ced3c87c94b12220dbac0527e1356702179 (patch) | |
| tree | e8662374ccf64386ed345ba31a6ad161e2ca6a92 /drivers/usb | |
| parent | bec444cd1c94c48df409a35ad4e5b143c245c3f7 (diff) | |
| download | linux-stable-93491ced3c87c94b12220dbac0527e1356702179.tar.gz linux-stable-93491ced3c87c94b12220dbac0527e1356702179.tar.bz2 linux-stable-93491ced3c87c94b12220dbac0527e1356702179.zip | |
USB: hub: fix SS max number of ports
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: dbe79bbe9dcb ("USB 3.0 Hub Changes")
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/core/hub.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index f77a4ebde7d5..b8bb20d7acdb 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -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; |