[all-commits] [llvm/llvm-project] 787a5e: [memprof] Fix use-after-free in peekBuildIds.

[Snehasish Kumar via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 787a5efb020f6020bc9b7610074cbdd55ea824f1
      https://github.com/llvm/llvm-project/commit/787a5efb020f6020bc9b7610074cbdd55ea824f1
  Author: Snehasish Kumar <snehasishk at google.com>
  Date:   2023-07-12 (Wed, 12 Jul 2023)

  Changed paths:
    M llvm/lib/ProfileData/RawMemProfReader.cpp

  Log Message:
  -----------
  [memprof] Fix use-after-free in peekBuildIds.

To check the uniqueness of buildids, we held on to a StringRef of the build id string pushed into the vector. If the number of build ids were large enough to trigger a realloc in the vector then these references where invalidated resulting in a use-after free. This was exposed in downstream usage.

Reviewed By: tejohnson

Differential Revision: https://reviews.llvm.org/D155110