linuxptp: Fixes published for CVE-2021-3570 and CVE-2021-3571

[Richard Cochran <richardcochran () gmail com>]

Dear list,

Now that the embargo period has expired, I published fixes for:

   CVE-2021-3570 linuxptp: missing length check of forwarded messages
   CVE-2021-3571 linuxptp: wrong length of one-step follow-up in transparent clock

The fixes have been published to SourceForge and to GitHub:

   https://sourceforge.net/projects/linuxptp
   https://github.com/richardcochran/linuxptp

The tags with the fixes are as follows:

   v1.5.1
   v1.6.1
   v1.7.1
   v1.8.1
   v1.9.3
   v2.0.1
   v3.1.1

In addition, the head of the master branch (soon to be version 3.2)
also includes the fixes.

Although it is possible to apply the fix to versions 1.2, 1.3, and
1.4, those versions are obsolete and do not pass our CI tests.  For
this reason I decided to withdraw them instead.

Thanks,
Richard