diff options
| author | Johan Hovold <johan@kernel.org> | 2017-05-10 18:18:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-26 07:13:09 +0200 |
| commit | ec443ee0c2aa3c1748de683bcda3714bb4d37010 (patch) | |
| tree | 7a91eb061be3bf6cb4d95e39bc8833291d21f457 | |
| parent | 7e2ad8b207f23a28cd3af7f0661fc1141c5a2375 (diff) | |
USB: hub: fix SS max number of ports
commit 93491ced3c87c94b12220dbac0527e1356702179 upstream.
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>
| -rw-r--r-- | drivers/usb/core/hub.c | 8 | ||||
| -rw-r--r-- | include/uapi/linux/usb/ch11.h | 3 |
2 files changed, 10 insertions, 1 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index b627392ad52a..1d59d489a1ad 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1318,7 +1318,13 @@ 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; diff --git a/include/uapi/linux/usb/ch11.h b/include/uapi/linux/usb/ch11.h index 331499d597fa..9ce10d4a0245 100644 --- a/include/uapi/linux/usb/ch11.h +++ b/include/uapi/linux/usb/ch11.h @@ -22,6 +22,9 @@ */ #define USB_MAXCHILDREN 31 +/* See USB 3.1 spec Table 10-5 */ +#define USB_SS_MAXPORTS 15 + /* * Hub request types */ |