[all-commits] [llvm/llvm-project] 11b20d: [clang] Fix an out-of-bound crash when checking te...

[Haojian Wu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 11b20d7ab09511d9e2bcd40606dfd3b31976efe0
      https://github.com/llvm/llvm-project/commit/11b20d7ab09511d9e2bcd40606dfd3b31976efe0
  Author: Haojian Wu <hokein.wu at gmail.com>
  Date:   2024-03-27 (Wed, 27 Mar 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/Sema/SemaConcept.cpp
    M clang/test/SemaTemplate/concepts.cpp

  Log Message:
  -----------
  [clang] Fix an out-of-bound crash when checking template partial specializations. (#86794)

I found this issue (a separate one) during the investigation of #86757,
the crash is similar in substituteParameterMappings, but at different
inner places.

This was an out-of-bound issue where we access front element in an empty
written template argument list to get the instantiation source range.
This patch fixes it by adding a proper guard.



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