[PATCH] D82017: [DebugInfo/DWARF] - Do not hang when CFI are truncated.

Wed Jun 17 08:03:50 PDT 2020

grimar created this revision.
grimar added reviewers: jhenderson, MaskRay, aprantl, probinson.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.
grimar retitled this revision from "[DebugInfo/DWARF] - Do not hang when the CFI is truncated." to "[DebugInfo/DWARF] - Do not hang when CFI are truncated.".

Currently when the .eh_frame section is truncated so that
CFI instructions can't be read, it is possible to enter
an infinite loop.

It happens because `CFIProgram::parse` does not handle errors properly.
This patch fixes the issue.

https://reviews.llvm.org/D82017

Files:
  llvm/include/llvm/DebugInfo/DWARF/DWARFDataExtractor.h
  llvm/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
  llvm/test/DebugInfo/X86/eh-frame-truncated-cfi.s

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