[ 16/47] cdc_ether: Ignore bogus union descriptor for RNDIS devices
From: Greg KH <gregkh@linuxfoundation.org>
Date: 2012-05-18 23:17:14
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3.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bj��rn Mork <bjorn@mork.no> commit 6eddcb4c82883451aec3be1240f17793370fa62f upstream. 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 <redacted> Cc: Iker Salm��n San Mill��n <redacted> Cc: Jonathan Nieder <redacted> Cc: Oliver Neukum <oliver@neukum.org> Cc: 655387@bugs.debian.org Signed-off-by: Bj��rn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/usb/cdc_ether.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c@@ -83,6 +83,7 @@ int usbnet_generic_cdc_bind(struct usbne struct cdc_state *info = (void *) &dev->data; int status; int rndis; + bool android_rndis_quirk = false; struct usb_driver *driver = driver_of(intf); struct usb_cdc_mdlm_desc *desc = NULL; struct usb_cdc_mdlm_detail_desc *detail = NULL;
@@ -195,6 +196,11 @@ int usbnet_generic_cdc_bind(struct usbne info->control, info->u->bSlaveInterface0, info->data); + /* fall back to hard-wiring for RNDIS */ + if (rndis) { + android_rndis_quirk = true; + goto next_desc; + } goto bad_desc; } if (info->control != intf) {
@@ -271,11 +277,15 @@ next_desc: /* Microsoft ActiveSync based and some regular RNDIS devices lack the * CDC descriptors, so we'll hard-wire the interfaces and not check * for descriptors. + * + * Some Android RNDIS devices have a CDC Union descriptor pointing + * to non-existing interfaces. Ignore that and attempt the same + * hard-wired 0 and 1 interfaces. */ - if (rndis && !info->u) { + if (rndis && (!info->u || android_rndis_quirk)) { info->control = usb_ifnum_to_if(dev->udev, 0); info->data = usb_ifnum_to_if(dev->udev, 1); - if (!info->control || !info->data) { + if (!info->control || !info->data || info->control != intf) { dev_dbg(&intf->dev, "rndis: master #0/%p slave #1/%p\n", info->control,