[Bug 58414] New: winedbg from winehq packages in Fedora 42 crashes during attaching to process.

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58414

Bug ID: 58414
           Summary: winedbg from winehq packages in Fedora 42 crashes
                    during attaching to process.
           Product: Wine
           Version: 10.10
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dbghelp
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 78829
  --> http://bugs.winehq.org/attachment.cgi?id=78829
fedora-42-winehq-devel-10.10-windbg-attach-crash.txt

While investigating bug #58335 I found me getting a crash from winedbg
when I tried to attach to some process like winemine.exe.

In function dwarf2_parse_compilation_unit it looks like comp_dir.u.string
is allowed to contain NULL because of the assignment in line 3090:
  3090                 comp_dir.u.string = NULL;

Unfortunately a few lines later this comp_dir.u.string is given to
function source_build_path:
  3100             tmp = source_build_path(comp_dir.u.string, name.u.string);

But therefore function source_build_path does an unconditional strlen(NULL),
which causes a SIGSEGV:
  62     unsigned bsz = strlen(base);