A SuperSpeed hub descriptor does not have any variable-length fields so
bail out when reading a short descriptor.
This avoids parsing and leaking two bytes of uninitialised slab data
through sysfs removable-attributes.
Fixes: dbe79bbe9dcb ("USB 3.0 Hub Changes")
Cc: stable <stable@xxxxxxxxxxxxxxx> # 2.6.39
Cc: John Youn <John.Youn@xxxxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/usb/core/hub.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 9dca59ef18b3..3ff1e9f89f2d 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -380,8 +380,12 @@ static int get_hub_descriptor(struct usb_device *hdev, void *data)
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
dtype << 8, 0, data, size,
USB_CTRL_GET_TIMEOUT);
- if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
+ if (hub_is_superspeed(hdev)) {
+ if (ret == size)
+ return ret;
+ } else if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) {
return ret;
+ }
}
return -EINVAL;
}
@@ -1321,7 +1325,7 @@ static int hub_configure(struct usb_hub *hub,
/* Request the entire hub descriptor.
* hub->descriptor can handle USB_MAXCHILDREN ports,
- * but the hub can/will return fewer bytes here.
+ * but a (non-SS) hub can/will return fewer bytes here.
*/
ret = get_hub_descriptor(hdev, hub->descriptor);
if (ret < 0) {
--
2.13.0
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