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| author | Johan Hovold <johan@kernel.org> | 2017-05-10 18:18:27 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-17 11:53:02 +0200 |
| commit | 2c25a2c818023df64463aac3288a9f969491e507 (patch) | |
| tree | ddf956c04e2d94384f7a8ab9e676d05ce5052497 /drivers/usb | |
| parent | ec963b412a54aac8e527708ecad06a6988a86fb4 (diff) | |
| download | linux-2c25a2c818023df64463aac3288a9f969491e507.tar.gz linux-2c25a2c818023df64463aac3288a9f969491e507.tar.bz2 linux-2c25a2c818023df64463aac3288a9f969491e507.zip | |
USB: hub: fix SS hub-descriptor handling
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@vger.kernel.org> # 2.6.39
Cc: John Youn <John.Youn@synopsys.com>
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, 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) { |