[llvm] r302180 - Don't return an invalid line table if the DW_AT_stmt_list value is not in the .debug_line section.

[David Blaikie via llvm-commits]

Test case?

On Thu, May 4, 2017 at 11:42 AM Greg Clayton via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> Author: gclayton
> Date: Thu May  4 13:29:44 2017
> New Revision: 302180
>
> URL: http://llvm.org/viewvc/llvm-project?rev=302180&view=rev
> Log:
> Don't return an invalid line table if the DW_AT_stmt_list value is not in
> the .debug_line section.
>
>
> Modified:
>     llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp
>
> Modified: llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp?rev=302180&r1=302179&r2=302180&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp (original)
> +++ llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp Thu May  4 13:29:44
> 2017
> @@ -692,6 +692,10 @@ DWARFContext::getLineTableForUnit(DWARFU
>    if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset))
>      return lt;
>
> +  // Make sure the offset is good before we try to parse.
> +  if (stmtOffset >= U->getLineSection().size())
> +    return nullptr;
> +
>    // We have to parse it first.
>    DataExtractor lineData(U->getLineSection(), isLittleEndian(),
>                           U->getAddressByteSize());
>
>
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