From: Wen Gong <wgong@xxxxxxxxxxxxxx>
Date: Fri, 3 Jan 2020 12:50:16 +0800
The len used for skb_put_padto is wrong, it need to add len of hdr.
There is another bug here, skb_put_padto() returns an error and frees
the SKB when the put fails. There really needs to be a check here,
because currently the code right now will keep using the freed up
skb in that situation.