linux-kernel - Re: [Linux-kernel-mentees][PATCH v2] net: usb: rtl8150: prevent set_ethernet

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Date:   Thu, 01 Oct 2020 19:15:22 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     anant.thazhemadam@...il.com
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org,
        syzbot+abbc768b560c84d92fd3@...kaller.appspotmail.com,
        petkan@...leusys.com, kuba@...nel.org, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Linux-kernel-mentees][PATCH v2] net: usb: rtl8150: prevent
 set_ethernet_addr from setting uninit address

From: Anant Thazhemadam <anant.thazhemadam@...il.com>
Date: Thu,  1 Oct 2020 13:02:20 +0530

> When get_registers() fails (which happens when usb_control_msg() fails)
> in set_ethernet_addr(), the uninitialized value of node_id gets copied
> as the address.
> 
> Checking for the return values appropriately, and handling the case
> wherein set_ethernet_addr() fails like this, helps in avoiding the
> mac address being incorrectly set in this manner.
> 
> Reported-by: syzbot+abbc768b560c84d92fd3@...kaller.appspotmail.com
> Tested-by: syzbot+abbc768b560c84d92fd3@...kaller.appspotmail.com
> Signed-off-by: Anant Thazhemadam <anant.thazhemadam@...il.com>
> Acked-by: Petko Manolov <petkan@...leusys.com>

First, please remove "Linux-kernel-mentees" from the Subject line.

All patch submitters should have their work judged equally, whoever
they are.  So this Subject text gives no extra information, and it
simply makes scanning Subject lines in one's mailer more difficult.

Second, when a MAC address fails to probe a random MAC address should
be selected.  We have helpers for this.  This way an interface still
comes up and is usable, even in the event of a failed MAC address
probe.