[Bug gprofng/30093] New: gprofng SIGSEGV when processing unusual dwarf

[gilles.m.duboscq at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30093

            Bug ID: 30093
           Summary: gprofng SIGSEGV when processing unusual dwarf
           Product: binutils
           Version: 2.41 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gprofng
          Assignee: vladimir.mezentsev at oracle dot com
          Reporter: gilles.m.duboscq at gmail dot com
  Target Milestone: ---

When running gprofng display text on some executables that contain unusual
dwarf data I am getting a segfault.
In particular, the input dwarf has some compilation units (DW_TAG_compile_unit)
that have neither DW_AT_comp_dir nor DW_AT_stmt_list.

The issue is that when that happens, DwrCU::stmt_list_offset remains 0, as a
result, in Dwarf::archive_Dwarf, the `get_dwrLineReg` call will process
whatever is at offset 0 in .debug_line.
Then while looking for source files, `DwrLineRegs::getPath` will potentially
try to use include_directories->fetch (0) which is NULL (no comp_dir
attribute).
This leads to a segfault in StringBuilder::append.

For reference, discussion on the dwarf-producing side:
https://github.com/oracle/graal/issues/5907

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