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

[DENG Qingfang]

On Wed, Feb 17, 2021 at 7:55 AM Linus Walleij <linus.wall...@linaro.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.