netdev - Re: [PATCH net] net: dsa: sja1105: fix use-after-free after calling of_find_compatible

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

Message-ID: <YR/sWodANPdthPyA@lunn.ch>
Date:   Fri, 20 Aug 2021 19:54:34 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Alvin Šipraga <ALSI@...g-olufsen.dk>,
        Vladimir Oltean <olteanv@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH net] net: dsa: sja1105: fix use-after-free after calling
 of_find_compatible_node, or worse

> 3. If dsa_register_switch() fails, we can't defer the probe (because
> it already succeeded). But I'm not sure if it's a likely error code.

That is not a safe assumption. The tagging driver can be a module, and
not be loaded yet. So we defer probing to allow it to load.

Ethernet switches can be a big graph of parts, not a nice tree of
parts.

    Andrew