MFS r353395:

Add missing input validation. This could result in reading from
uninitialized memory.
The issue was found by OSS-Fuzz for usrsctp and reported in
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=17780

MFS r353396:

Cleanup sctp_asconf_error_response() and ensure that the parameter
is padded as required. This fixes the followig bug reported by
OSS-Fuzz for the usersctp stack:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=17790

MFS r353397:

When skipping the address parameter, take the padding into account.

MFS r353398:

Fix the adding of padding to COOKIE-ECHO chunks.

Thanks to Mark Wodrich who found this issue while fuzz testing the
usrsctp stack and reported the issue in
https://github.com/sctplab/usrsctp/issues/382

MFS r353399:

Plumb an mbuf leak found by Mark Wodrich from Google by fuzz testing the
userland stack and reporting it in:
https://github.com/sctplab/usrsctp/issues/396

MFS r353400:

Fix a use after free bug when removing remote addresses.
This bug was found by OSS-Fuzz and reported in
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18004

MFS r353401:

Plumb an mbuf leak in a code path that should not be taken. Also avoid
that this path is taken by setting the tail pointer correctly.
There is still bug related to handling unordered unfragmented messages
which were delayed in deferred handling.
This issue was found by OSS-Fuzz testing the usrsctp stack and reported
in
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=17794

MFS r353403:

Validate length before use it, not vice versa.
r353060 should have contained this...
This fixes
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18070

Approved by: re (gjb@)