target/linux/generic/backport-5.10/882-v5.19-rndis_host-limit-scope-of-bogus-MAC-address-detectio.patch

   1 From 1bfbe1799b9ec5d00f7f032d6e7db1980e466aeb Mon Sep 17 00:00:00 2001
   2 From: Lech Perczak <lech.perczak@gmail.com>
   3 Date: Sat, 2 Apr 2022 02:19:57 +0200
   4 Subject: [PATCH 3/3] rndis_host: limit scope of bogus MAC address detection to
   5  ZTE devices
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 Reporting of bogus MAC addresses and ignoring configuration of new
  11 destination address wasn't observed outside of a range of ZTE devices,
  12 among which this seems to be the common bug. Align rndis_host driver
  13 with implementation found in cdc_ether, which also limits this workaround
  14 to ZTE devices.
  15
  16 Suggested-by: Bjørn Mork <bjorn@mork.no>
  17 Cc: Kristian Evensen <kristian.evensen@gmail.com>
  18 Cc: Oliver Neukum <oliver@neukum.org>
  19 Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
  20 ---
  21  drivers/net/usb/rndis_host.c | 17 ++++++++++++-----
  22  1 file changed, 12 insertions(+), 5 deletions(-)
  23
  24 --- a/drivers/net/usb/rndis_host.c
  25 +++ b/drivers/net/usb/rndis_host.c
  26 @@ -418,10 +418,7 @@ generic_rndis_bind(struct usbnet *dev, s
  27                 goto halt_fail_and_release;
  28         }
  29
  30 -       if (bp[0] & 0x02)
  31 -               eth_hw_addr_random(net);
  32 -       else
  33 -               ether_addr_copy(net->dev_addr, bp);
  34 +       ether_addr_copy(net->dev_addr, bp);
  35
  36         /* set a nonzero filter to enable data transfers */
  37         memset(u.set, 0, sizeof *u.set);
  38 @@ -463,6 +460,16 @@ static int rndis_bind(struct usbnet *dev
  39         return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
  40  }
  41
  42 +static int zte_rndis_bind(struct usbnet *dev, struct usb_interface *intf)
  43 +{
  44 +       int status = rndis_bind(dev, intf);
  45 +
  46 +       if (!status && (dev->net->dev_addr[0] & 0x02))
  47 +               eth_hw_addr_random(dev->net);
  48 +
  49 +       return status;
  50 +}
  51 +
  52  void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
  53  {
  54         struct rndis_halt       *halt;
  55 @@ -615,7 +622,7 @@ static const struct driver_info     zte_rndi
  56         .description =  "ZTE RNDIS device",
  57         .flags =        FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
  58         .data =         RNDIS_DRIVER_DATA_DST_MAC_FIXUP,
  59 -       .bind =         rndis_bind,
  60 +       .bind =         zte_rndis_bind,
  61         .unbind =       rndis_unbind,
  62         .status =       rndis_status,
  63         .rx_fixup =     rndis_rx_fixup,