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cdc_ether: Ignore bogus union descriptor for RNDIS devices
Some RNDIS devices include a bogus CDC Union descriptor pointing to non-existing interfaces. The RNDIS code is already prepared to handle devices without a CDC Union descriptor by hardwiring the driver to use interfaces 0 and 1, which is correct for the devices with the bogus descriptor as well. So we can reuse the existing workaround. Cc: Markus Kolb <linux-201011@tower-net.de> Cc: Iker Salmón San Millán <shaola@esdebian.org> Cc: Jonathan Nieder <jrnieder@gmail.com> Cc: Oliver Neukum <oliver@neukum.org> Cc: 655387@bugs.debian.org Cc: stable@vger.kernel.org Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 12 additions and 2 deletions
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@ -83,6 +83,7 @@ int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
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struct cdc_state *info = (void *) &dev->data;
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int status;
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int rndis;
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bool android_rndis_quirk = false;
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struct usb_driver *driver = driver_of(intf);
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struct usb_cdc_mdlm_desc *desc = NULL;
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struct usb_cdc_mdlm_detail_desc *detail = NULL;
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@ -195,6 +196,11 @@ int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
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info->control,
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info->u->bSlaveInterface0,
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info->data);
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/* fall back to hard-wiring for RNDIS */
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if (rndis) {
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android_rndis_quirk = true;
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goto next_desc;
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}
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goto bad_desc;
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}
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if (info->control != intf) {
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@ -271,11 +277,15 @@ int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
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/* Microsoft ActiveSync based and some regular RNDIS devices lack the
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* CDC descriptors, so we'll hard-wire the interfaces and not check
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* for descriptors.
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*
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* Some Android RNDIS devices have a CDC Union descriptor pointing
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* to non-existing interfaces. Ignore that and attempt the same
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* hard-wired 0 and 1 interfaces.
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*/
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if (rndis && !info->u) {
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if (rndis && (!info->u || android_rndis_quirk)) {
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info->control = usb_ifnum_to_if(dev->udev, 0);
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info->data = usb_ifnum_to_if(dev->udev, 1);
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if (!info->control || !info->data) {
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if (!info->control || !info->data || info->control != intf) {
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dev_dbg(&intf->dev,
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"rndis: master #0/%p slave #1/%p\n",
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info->control,
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