The updated patch is in the attachment.

---------- Původní e-mail ----------
Od: Stephen Hemminger <stephen@networkplumber.org>
Komu: tomaspaukrt@email.cz
Datum: 31. 8. 2019 17:38:01
Předmět: Re: iproute2: tc: potential buffer overflow
On Sat, 31 Aug 2019 15:13:27 +0200 (CEST)
<tomaspaukrt@email.cz> wrote:

> Hi,
>
> there are two potentially dangerous calls of strcpy function in the program "tc". In the attachment is a patch that fixes this issue.
>
> Tomas

This looks correct.

Please fix with strlcpy() instead; that is clearer.
Plus you can use XT_EXTENSION_MAX_NAMELEN here (optional).