netdev - Re: [PATCH] net: dsa: tag_rtl4_a: Support also egress tags

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Message-ID: <CALW65jbEjWtb3ww=Bq5WKrjpQ=fjrxCBKyxxxi0CGRAVAkdO7g@mail.gmail.com>
Date:   Wed, 17 Feb 2021 20:38:30 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        Mauri Sandberg <sandberg@...lfence.com>
Subject: Re: [PATCH] net: dsa: tag_rtl4_a: Support also egress tags

On Wed, Feb 17, 2021 at 7:55 AM Linus Walleij <linus.walleij@...aro.org> wrote:
>
> +
> +       /* Pad out to at least 60 bytes */
> +       if (unlikely(eth_skb_pad(skb)))
> +               return NULL;

I just found that this will cause double free (eth_skb_pad will free
the skb if allocation fails, and dsa_slave_xmit will still try to free
it because it returns NULL.
Replace eth_skb_pad(skb) with __skb_put_padto(skb, ETH_ZLEN, false) to
avoid that.