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

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Message-ID: <a838e69d-c286-65ba-2e29-73b9240e7191@gmail.com>
Date:   Mon, 22 Mar 2021 16:22:52 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     George McCollister <george.mccollister@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...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 3/22/2021 1:26 PM, 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>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian