(bfd_section_from_shdr): Add sanity check when parsing dynamic sections.

bfd/ChangeLog

@@ -1,3 +1,8 @@
+2005-05-17  Tavis Ormandy <taviso@gentoo.org>
+
+	* elf.c (bfd_section_from_shdr): Add sanity check when parsing
+	dynamic sections.
+
 2005-05-17  Alan Modra  <amodra@bigpond.net.au>
 
 	* elf32-ppc.c (LIS_11. LIS_12): Define.

bfd/elf.c

@@ -1768,6 +1768,9 @@ bfd_section_from_shdr (bfd *abfd, unsigned int shindex)
     case SHT_DYNAMIC:	/* Dynamic linking information.  */
       if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
 	return FALSE;
+      if (hdr->sh_link > elf_numsections (abfd)
+	  || elf_elfsections (abfd)[hdr->sh_link] == NULL)
+	return FALSE;
       if (elf_elfsections (abfd)[hdr->sh_link]->sh_type != SHT_STRTAB)
 	{
 	  Elf_Internal_Shdr *dynsymhdr;