[all-commits] [llvm/llvm-project] a54fce: [libc++abi] Don't do pointer arithmetic on nullptr...

[Vitaly Buka via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a54fce89fc8aff36c50e3a0ea2f92e1ab7093cf8
      https://github.com/llvm/llvm-project/commit/a54fce89fc8aff36c50e3a0ea2f92e1ab7093cf8
  Author: Vitaly Buka <vitalybuka at google.com>
  Date:   2024-12-11 (Wed, 11 Dec 2024)

  Changed paths:
    M libcxxabi/src/private_typeinfo.cpp

  Log Message:
  -----------
  [libc++abi] Don't do pointer arithmetic on nullptr (#119520)

`nullptr + offset` is possible after `!is_virtual` branch.

Detected with check-cxxabi on configured with:
```
cmake -DLLVM_APPEND_VC_REV=OFF -GNinja \
  -DCMAKE_BUILD_TYPE=Release \
  -DLLVM_CCACHE_BUILD=ON \
  -DLLVM_USE_LINKER=lld \
  -DLLVM_ENABLE_ASSERTIONS=ON \
  -DCMAKE_C_COMPILER=clang \
  -DCMAKE_CXX_COMPILER=clang++ \
  -DLIBCXXABI_USE_LLVM_UNWINDER=OFF \
  -DCMAKE_INSTALL_PREFIX=/home/b/sanitizer-aarch64-linux-bootstrap-ubsan/build/libcxx_install_ubsan \
  '-DLLVM_ENABLE_RUNTIMES=libcxx;libcxxabi;libunwind' \
  -DLIBCXX_TEST_PARAMS=long_tests=False \
  -DLIBCXX_INCLUDE_BENCHMARKS=OFF \
  -DLLVM_USE_SANITIZER=Undefined \
  '-DCMAKE_C_FLAGS=-fsanitize=undefined -fno-sanitize-recover=all   -fno-sanitize=vptr' \
  '-DCMAKE_CXX_FLAGS=-fsanitize=undefined -fno-sanitize-recover=all   -fno-sanitize=vptr' \
  /home/b/sanitizer-aarch64-linux-bootstrap-ubsan/build/llvm-project/llvm/../runtimes

********************
Failed Tests (2):
  llvm-libc++abi-shared.cfg.in :: catch_null_pointer_to_object_pr64953.pass.cpp
  llvm-libc++abi-shared.cfg.in :: catch_ptr_02.pass.cpp
```



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