netdev - Re: [PATCH net-next] net: phy: avoid NPE if read_page/write

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Fri, 18 Oct 2019 12:58:25 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     hkallweit1@...il.com
Cc:     andrew@...n.ch, f.fainelli@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: phy: avoid NPE if read_page/write_page
 callbacks are not available

From: Heiner Kallweit <hkallweit1@...il.com>
Date: Wed, 16 Oct 2019 21:53:31 +0200

> Currently there's a bug in the module subsystem [0] preventing load of
> the PHY driver module on certain systems (as one symptom).
> This results in a NPE on such systems for the following reason:
> Instead of the correct PHY driver the genphy driver is loaded that
> doesn't implement the read_page/write_page callbacks. Every call to
> phy_read_paged() et al will result in a NPE therefore.
> 
> In parallel to fixing the root cause we should make sure that this one
> and maybe similar issues in other subsystems don't result in a NPE
> in phylib. So let's check for the callbacks before using them and warn
> once if they are not available.
> 
> [0] https://marc.info/?t=157072642100001&r=1&w=2
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

I read the discussion over a few times and this looks good to me for now,
so applied.

Thanks.