[all-commits] [llvm/llvm-project] 871086: [flang] Avoid passing null pointers to nonnull par...

[Krzysztof Parzyszek via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 871086bf7fad42d610bfe02224662bdc71494a70
      https://github.com/llvm/llvm-project/commit/871086bf7fad42d610bfe02224662bdc71494a70
  Author: Krzysztof Parzyszek <Krzysztof.Parzyszek at amd.com>
  Date:   2024-03-12 (Tue, 12 Mar 2024)

  Changed paths:
    M flang/include/flang/Parser/char-block.h
    M flang/runtime/buffer.h
    M flang/runtime/temporary-stack.cpp

  Log Message:
  -----------
  [flang] Avoid passing null pointers to nonnull parameters (#84785)

Certain functions in glibc have "nonnull" attributes on pointer
parameters (even in cases where passing a null pointer should be handled
correctly). There are a few cases of such calls in flang: memcmp and
memcpy with the length parameter set to 0.

Avoid passing a null pointer to these functions, since the conflict with
the nonnull attribute could cause an undefined behavior.

This was detected by the undefined behavior sanitizer.



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