Avoid segfault on missing directory table.

2015-05-08  Yao Qi  <yao@codesourcery.com>
	    Sandra Loosemore  <sandra@codesourcery.com>

	gdb/
	* dwarf2read.c (setup_type_unit_groups): Do NULL pointer check
	to 'lh->include_dirs' before accessing to it.
	(psymtab_include_file_name): Likewise.
	(dwarf_decode_lines_1): Likewise.
	(dwarf_decode_lines): Likewise.
	(file_file_name): Likewise.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b7a29e6..1004e11 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,13 @@
+2015-05-08  Yao Qi  <yao@codesourcery.com>
+           Sandra Loosemore  <sandra@codesourcery.com>
+
+       * dwarf2read.c (setup_type_unit_groups): Do NULL pointer check
+       to 'lh->include_dirs' before accessing to it.
+       (psymtab_include_file_name): Likewise.
+       (dwarf_decode_lines_1): Likewise.
+       (dwarf_decode_lines): Likewise.
+       (file_file_name): Likewise.
+
 2015-05-08  Sandra Loosemore  <sandra@codesourcery.com>
 
        * nios2-linux-tdep.c (NIOS2_SIGRETURN_TRAMP_ADDR): Define.

diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 8d9a394..23a2521 100644 (file)
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -9320,7 +9320,7 @@ setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
          const char *dir = NULL;
          struct file_entry *fe = &lh->file_names[i];
 
-         if (fe->dir_index)
+         if (fe->dir_index && lh->include_dirs != NULL)
            dir = lh->include_dirs[fe->dir_index - 1];
          dwarf2_start_subfile (fe->name, dir);
 
@@ -17396,7 +17396,7 @@ psymtab_include_file_name (const struct line_header *lh, int file_index,
   char *copied_name = NULL;
   int file_is_pst;
 
-  if (fe.dir_index)
+  if (fe.dir_index && lh->include_dirs != NULL)
     dir_name = lh->include_dirs[fe.dir_index - 1];
 
   if (!IS_ABSOLUTE_PATH (include_name)
@@ -17595,7 +17595,7 @@ dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
           struct file_entry *fe = &lh->file_names[file - 1];
           const char *dir = NULL;
 
-          if (fe->dir_index)
+          if (fe->dir_index && lh->include_dirs != NULL)
             dir = lh->include_dirs[fe->dir_index - 1];
 
          dwarf2_start_subfile (fe->name, dir);
@@ -17815,7 +17815,7 @@ dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
                 else
                   {
                     fe = &lh->file_names[file - 1];
-                    if (fe->dir_index)
+                    if (fe->dir_index && lh->include_dirs != NULL)
                       dir = lh->include_dirs[fe->dir_index - 1];
                     if (!decode_for_pst_p)
                       {
@@ -17958,7 +17958,7 @@ dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
          struct file_entry *fe;
 
          fe = &lh->file_names[i];
-         if (fe->dir_index)
+         if (fe->dir_index && lh->include_dirs != NULL)
            dir = lh->include_dirs[fe->dir_index - 1];
          dwarf2_start_subfile (fe->name, dir);
 
@@ -20640,7 +20640,8 @@ file_file_name (int file, struct line_header *lh)
     {
       struct file_entry *fe = &lh->file_names[file - 1];
 
-      if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
+      if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0
+         || lh->include_dirs == NULL)
         return xstrdup (fe->name);
       return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
                     fe->name, NULL);