netdev - Re: [PATCH net] net: dsa: don't assign an error value to tag

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Message-ID: <20210322204633.ptvwd2jinybnxcje@skbuf>
Date:   Mon, 22 Mar 2021 22:46:33 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     George McCollister <george.mccollister@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: don't assign an error value to tag_ops

On Mon, Mar 22, 2021 at 03:26:50PM -0500, George McCollister wrote:
> Use a temporary variable to hold the return value from
> dsa_tag_driver_get() instead of assigning it to dst->tag_ops. Leaving
> an error value in dst->tag_ops can result in deferencing an invalid
> pointer when a deferred switch configuration happens later.
> 
> Fixes: 357f203bb3b5 ("net: dsa: keep a copy of the tagging protocol in the DSA switch tree")
> 
> Signed-off-by: George McCollister <george.mccollister@...il.com>
> ---

Who dereferences the invalid pointer? dsa_tree_free I guess?