Fix invalid memory access in the BFD library's DWARF parser.

	PR binutils/21151
	* dwarf2.c (_bfd_dwarf2_find_nearest_line): Check for an invalid
	unit length field.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index f21d654..1c3d701 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,9 @@
+2017-02-13  Nick Clifton  <nickc@redhat.com>
+
+       PR binutils/21151
+       * dwarf2.c (_bfd_dwarf2_find_nearest_line): Check for an invalid
+       unit length field.
+
 2017-02-07  Andrew Waterman  <andrew@sifive.com>
 
        * elfnn-riscv.c (riscv_elf_finish_dynamic_sections): Only write PLT

diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index 3699587..6b111d3 100644 (file)
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -4294,6 +4294,10 @@ _bfd_dwarf2_find_nearest_line (bfd *abfd,
        {
          bfd_byte * new_ptr;
 
+         /* PR 21151  */
+         if (stash->info_ptr + length > stash->info_ptr_end)
+           return FALSE;
+
          each = parse_comp_unit (stash, length, info_ptr_unit,
                                  offset_size);
          if (!each)