PR ld/12451

* elfcode.h (elf_checksum_contents): Read in the section's
	contents if they are not already available.
	* compress.c (bfd_get_full_section_contents): Use zmalloc to
	allocate the buffers so that excess bytes are guaranteed to be
	zero.

bfd/ChangeLog

@@ -1,3 +1,12 @@
+2011-12-14  Nick Clifton  <nickc@redhat.com>
+
+	PR ld/12451
+	* elfcode.h (elf_checksum_contents): Read in the section's
+	contents if they are not already available.
+	* compress.c (bfd_get_full_section_contents): Use zmalloc to
+	allocate the buffers so that excess bytes are guaranteed to be
+	zero.
+
 2011-12-14  Iain Sandoe  <iains@gcc.gnu.org>
 
 	* mach-o-i386.c (text_section_names_xlat): New table.

bfd/compress.c

@@ -181,7 +181,7 @@ bfd_get_full_section_contents (bfd *abfd, sec_ptr sec, bfd_byte **ptr)
     case COMPRESS_SECTION_NONE:
       if (p == NULL)
 	{
-	  p = (bfd_byte *) bfd_malloc (sz);
+	  p = (bfd_byte *) bfd_zmalloc (sz);
 	  if (p == NULL)
 	    return FALSE;
 	}
@@ -221,7 +221,7 @@ bfd_get_full_section_contents (bfd *abfd, sec_ptr sec, bfd_byte **ptr)
       if (!ret)
 	goto fail_compressed;
 
-      uncompressed_buffer = (bfd_byte *) bfd_malloc (uncompressed_size);
+      uncompressed_buffer = (bfd_byte *) bfd_zmalloc (uncompressed_size);
       if (uncompressed_buffer == NULL)
 	goto fail_compressed;
 

bfd/elfcode.h

@@ -1097,8 +1097,28 @@ elf_checksum_contents (bfd *abfd,
       elf_swap_shdr_out (abfd, &i_shdr, &x_shdr);
       (*process) (&x_shdr, sizeof x_shdr, arg);
 
+      /* PR ld/12451:
+	 Process the section's contents; reading them in if necessary.  */
       if (i_shdr.contents)
 	(*process) (i_shdr.contents, i_shdr.sh_size, arg);
+      else
+	{
+	  asection *sec;
+
+	  sec = bfd_section_from_elf_index (abfd, count);
+	  if (sec != NULL)
+	    {
+	      if (sec->contents == NULL)
+		{
+		  /* Force rereading from file.  */
+		  sec->flags &= ~SEC_IN_MEMORY;
+		  if (! bfd_malloc_and_get_section (abfd, sec, & sec->contents))
+		    continue;
+		}
+	      if (sec->contents != NULL)
+		(*process) (sec->contents, i_shdr.sh_size, arg);
+	    }
+	}
     }
 
   return TRUE;