Cherry picking additional usrsctp OOB access fixes.

This branch now contains three cherry picked commits:
https://chromium.googlesource.com/external/github.com/sctplab/usrsctp/+log/995c0b844144..a3c3ef666b7a

Bug: chromium:1163228
Change-Id: Icd506393d323f0fa1dbeb12546a224d09c4a77be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617212Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841434}

DEPS

@@ -1483,7 +1483,7 @@ deps = {
   },
 
   'src/third_party/usrsctp/usrsctplib':
-    Var('chromium_git') + '/external/github.com/sctplab/usrsctp' + '@' + '2c26785bed47cf18e127c516ab242b4e3781ed20',
+    Var('chromium_git') + '/external/github.com/sctplab/usrsctp' + '@' + 'a3c3ef666b7a5e4c93ebae5a7462add6f86f5cf2',
 
   'src/third_party/vulkan-deps': '{chromium_git}/vulkan-deps@ffb3b84133b03dfc4b83a8430a418f4fa94308d8',
 

third_party/usrsctp/README.chromium

@@ -21,4 +21,7 @@ as well as updates and enhancements from the following Internet Drafts:
    draft-iyengar-sctp-cacc-00.txt
 
 Local Modifications:
-Cherry picked d844a690d30ace22de75e8b80d9bb08ae7283795
+Cherry picked:
\ No newline at end of file
+d844a690d30ace22de75e8b80d9bb08ae7283795
+355fb576b1a9dfef70fc0e158d66692662baaddc
+7dab23aa0d8db86fedd222a308067439b03fad0f