dbghelp: Make dwarf2_parse_line_numbers handle missing line number section.

dlls/dbghelp/dwarf.c

@@ -150,6 +150,7 @@ typedef struct dwarf2_debug_info_s
     struct vector               children;
 } dwarf2_debug_info_t;
 
+#define NO_MAP                  ((const void*)0xffffffff)
 
 typedef struct dwarf2_section_s
 {
@@ -1595,6 +1596,10 @@ static void dwarf2_parse_line_numbers(const dwarf2_section_t* sections,
     struct vector               files;
     const char**                p;
 
+    /* section with line numbers stripped */
+    if (sections[section_line].address == NO_MAP)
+        return;
+
     traverse.data = sections[section_line].address + offset;
     traverse.start_data = traverse.data;
     traverse.end_data = traverse.data + 4;

dlls/dbghelp/elf_module.c

@@ -901,7 +901,7 @@ static BOOL elf_load_debug_info_from_map(struct module* module,
                                     dw2_debug, fmap->sect[debug_sect].shdr.sh_size,
                                     dw2_debug_abbrev, fmap->sect[debug_abbrev_sect].shdr.sh_size,
                                     dw2_debug_str, fmap->sect[debug_str_sect].shdr.sh_size,
-                                    dw2_debug_line, fmap->sect[debug_line_sect].shdr.sh_size);
+                                    dw2_debug_line, dw2_debug_line != NO_MAP ? fmap->sect[debug_line_sect].shdr.sh_size : 0);
                 if (!lret)
                     WARN("Couldn't correctly read stabs\n");
                 ret = ret || lret;