Fix illegal memory access parsing corrupt DWARF information.

	PR 29936
	* dwarf2.c (concat_filename): Fix check for a directory index off
	the end of the directory table.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 81227dc..49e18c9 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,9 @@
+2022-12-23  Nick Clifton  <nickc@redhat.com>
+
+       PR 29936
+       * dwarf2.c (concat_filename): Fix check for a directory index off
+       the end of the directory table.
+
 2022-12-21  Nick Clifton  <nickc@redhat.com>
 
        * po/ro.po: Updated Romanian translation.

diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index b608afb..88335cb 100644 (file)
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -2047,7 +2047,8 @@ concat_filename (struct line_info_table *table, unsigned int file)
 
       if (table->files[file].dir
          /* PR 17512: file: 0317e960.  */
-         && table->files[file].dir <= table->num_dirs
+         && table->files[file].dir
+         <= (table->use_dir_and_file_0 ? table->num_dirs - 1 : table->num_dirs)
          /* PR 17512: file: 7f3d2e4b.  */
          && table->dirs != NULL)
        {