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Jonas Devlieghere 81a623d6d6 [DebugInfo] Don't crash when given invalid DWARFv5 line table prologue.

This patch replaces an assertion with an explicit check for the validity
of the FORM parameters. The assertion was triggered when the DWARFv5
line table contained a zero address size.

This fixes OSS-Fuzz Issue 4644
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4644

Differential revision: https://reviews.llvm.org/D41615

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321863 91177308-0d34-0410-b5e6-96231b3b80d8

2018-01-05 10:03:02 +00:00

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 Verify that dwarfdump doesn't crash on invalid line table prologue.
 OSS-Fuzz Issue 4644 (https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4644)
 RUN: llvm-dwarfdump --verbose %p/Inputs/invalid.linetable 2>&1 | FileCheck %s --check-prefix=INVALID-LINE-TABLE
 INVALID-LINE-TABLE: invalid directory or file table description