ACK: [X/B/D][SRU] Fix for CVE-2019-20096

[Khaled Elmously]

On 2020-01-21 15:54:13 , Connor Kuehl wrote:
> https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-20096.html
> 
> From the link above:
> 
>     "In the Linux kernel before 5.1, there is a memory leak in
>     __feat_register_sp() in net/dccp/feat.c, which may cause denial of service,
>     aka CID-1d3ff0950e2b."
> 
> Clean cherry picks.
> 

Acked-by: Khalid Elmously <khalid.elmously at canonical.com>