[all-commits] [llvm/llvm-project] 7a8790: [scudo] Fix stack depot validation. (#87024)

[Christopher Ferris via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7a87902684b5e15644f037401e88b1f0c2c5fc6f
      https://github.com/llvm/llvm-project/commit/7a87902684b5e15644f037401e88b1f0c2c5fc6f
  Author: Christopher Ferris <cferris1000 at users.noreply.github.com>
  Date:   2024-03-28 (Thu, 28 Mar 2024)

  Changed paths:
    M compiler-rt/lib/scudo/standalone/stack_depot.h

  Log Message:
  -----------
  [scudo] Fix stack depot validation. (#87024)

In the StackDepot::isValid function, there is work to validate the
TabMask variable. Unfortunately, if TabMask is set to the maximum
allowed value, TabSize = TabMask + 1 becomes zero and validation passes.

Disallow that case to prevent invalid reads into the Tab structure.



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