RE: [PATCH net] net: dsa: ksz: fix skb freeing

[Woojung.Huh]

> The DSA layer frees the original skb when an xmit function returns NULL,
> meaning an error occurred. But if the tagging code copied the original
> skb, it is responsible of freeing the copy if an error occurs.
> 
> The ksz tagging code currently has two issues: if skb_put_padto fails,
> the skb copy is not freed, and the original skb will be freed twice.
> 
> To fix that, move skb_put_padto inside both branches of the skb_tailroom
> condition, before freeing the original skb, and free the copy on error.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Woojung Huh <woojung.huh@xxxxxxxxxxxxx>