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From 9bfb4bcda7ba32d73ea322ea56a8ebe32e9247f6 Mon Sep 17 00:00:00 2001
From: Lech Perczak <lech.perczak@gmail.com>
Date: Sat, 2 Apr 2022 02:19:57 +0200
Subject: [PATCH 3/3] rndis_host: limit scope of bogus MAC address detection to
ZTE devices
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Reporting of bogus MAC addresses and ignoring configuration of new
destination address wasn't observed outside of a range of ZTE devices,
among which this seems to be the common bug. Align rndis_host driver
with implementation found in cdc_ether, which also limits this workaround
to ZTE devices.
Suggested-by: Bjørn Mork <bjorn@mork.no>
Cc: Kristian Evensen <kristian.evensen@gmail.com>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
---
drivers/net/usb/rndis_host.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
--- a/drivers/net/usb/rndis_host.c
+++ b/drivers/net/usb/rndis_host.c
@@ -418,10 +418,7 @@ generic_rndis_bind(struct usbnet *dev, s
goto halt_fail_and_release;
}
- if (bp[0] & 0x02)
- eth_hw_addr_random(net);
- else
- ether_addr_copy(net->dev_addr, bp);
+ ether_addr_copy(net->dev_addr, bp);
/* set a nonzero filter to enable data transfers */
memset(u.set, 0, sizeof *u.set);
@@ -463,6 +460,16 @@ static int rndis_bind(struct usbnet *dev
return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
}
+static int zte_rndis_bind(struct usbnet *dev, struct usb_interface *intf)
+{
+ int status = rndis_bind(dev, intf);
+
+ if (!status && (dev->net->dev_addr[0] & 0x02))
+ eth_hw_addr_random(dev->net);
+
+ return status;
+}
+
void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
{
struct rndis_halt *halt;
@@ -615,7 +622,7 @@ static const struct driver_info zte_rndi
.description = "ZTE RNDIS device",
.flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
.data = RNDIS_DRIVER_DATA_DST_MAC_FIXUP,
- .bind = rndis_bind,
+ .bind = zte_rndis_bind,
.unbind = rndis_unbind,
.status = rndis_status,
.rx_fixup = rndis_rx_fixup,
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