linux-kernel - Re: [PATCH 5.15] usb: gadget: u_ether: fix regression in setting fixed MAC address

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Date:   Thu, 23 Jun 2022 17:52:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Marian Postevca <posteuca@...ex.one>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Maximilian Senftleben <kernel@...l.msdigital.de>,
        stable@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5.15] usb: gadget: u_ether: fix regression in setting
 fixed MAC address

On Wed, Jun 22, 2022 at 11:18:04PM +0300, Marian Postevca wrote:
> commit b337af3a4d6147000b7ca6b3438bf5c820849b37 upstream.
> 
> In systemd systems setting a fixed MAC address through
> the "dev_addr" module argument fails systematically.
> When checking the MAC address after the interface is created
> it always has the same but different MAC address to the one
> supplied as argument.
> 
> This is partially caused by systemd which by default will
> set an internally generated permanent MAC address for interfaces
> that are marked as having a randomly generated address.
> 
> Commit 890d5b40908bfd1a ("usb: gadget: u_ether: fix race in
> setting MAC address in setup phase") didn't take into account
> the fact that the interface must be marked as having a set
> MAC address when it's set as module argument.
> 
> Fixed by marking the interface with NET_ADDR_SET when
> the "dev_addr" module argument is supplied.
> 
> Reported-by: Maximilian Senftleben <kernel@...l.msdigital.de>
> Cc: stable@...r.kernel.org
> Fixes: 890d5b40908bfd1a ("usb: gadget: u_ether: fix race in setting MAC address in setup phase")
> Signed-off-by: Marian Postevca <posteuca@...ex.one>
> ---
>  drivers/usb/gadget/function/u_ether.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)

All now queued up, thanks.

greg k-h