[all-commits] [llvm/llvm-project] b3452d: [asan] Detect dereferencing zero-alloc as heap buf...

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b3452d90b043a398639e62b0ab01aa339cc649de
      https://github.com/llvm/llvm-project/commit/b3452d90b043a398639e62b0ab01aa339cc649de
  Author: Thurston Dang <thurston at google.com>
  Date:   2025-08-29 (Fri, 29 Aug 2025)

  Changed paths:
    M compiler-rt/lib/asan/asan_allocator.cpp
    M compiler-rt/test/asan/TestCases/zero_alloc.cpp

  Log Message:
  -----------
  [asan] Detect dereferencing zero-alloc as heap buffer overflow (#155943)

When a zero-byte allocation is requested, ASan actually allocates 1-byte
for compatibility. This change poisons that byte, to detect
dereferences.

Also updates the test from #155933



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