[all-commits] [llvm/llvm-project] 18c84e: [clang][dataflow] Fix nullptr dereferencing error.

[Yitzhak Mandelbaum via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 18c84e2d325fe64f303a13b17addce1c0e6aca23
      https://github.com/llvm/llvm-project/commit/18c84e2d325fe64f303a13b17addce1c0e6aca23
  Author: Yitzhak Mandelbaum <yitzhakm at google.com>
  Date:   2022-03-08 (Tue, 08 Mar 2022)

  Changed paths:
    M clang/include/clang/Analysis/FlowSensitive/Value.h
    M clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
    M clang/unittests/Analysis/FlowSensitive/DataflowEnvironmentTest.cpp
    M clang/unittests/Analysis/FlowSensitive/TransferTest.cpp

  Log Message:
  -----------
  [clang][dataflow] Fix nullptr dereferencing error.

When pre-initializing fields in the environment, the code assumed that all
fields of a struct would be initialized. However, given limits on value
construction, that assumption is incorrect. This patch changes the code to drop
that assumption and thereby avoid dereferencing a nullptr.

Differential Revision: https://reviews.llvm.org/D121158