Fix illegal memory accesses trigeered when linking corrupt input files.

	PR 23055
	* aoutx.h (find_nearest_line): Check that the symbol name exists
	and is long enough, before attempting to see if it is for a .o
	file.
	* hash.c (bfd_hash_hash): Add an assertion that the string is not
	NULL.
	* linker.c (bfd_link_hash_lookup): Fail if the table or string are
	NULL.
	(_bfd_generic_link_add_archive_symbols): Fail if an archive entry
	has no name.

1 files changed, 6 insertions, 0 deletions

diff --git a/bfd/linker.c b/bfd/linker.c
index c29a6e7e102..3019919a916 100644
--- a/bfd/linker.c
+++ b/bfd/linker.c
@@ -495,6 +495,9 @@ bfd_link_hash_lookup (struct bfd_link_hash_table *table,
 {
   struct bfd_link_hash_entry *ret;
 
+  if (table == NULL || string == NULL)
+    return NULL;
+
   ret = ((struct bfd_link_hash_entry *)
 	 bfd_hash_lookup (&table->table, string, create, copy));
 
@@ -941,6 +944,9 @@ _bfd_generic_link_add_archive_symbols
 	      continue;
 	    }
 
+	  if (arsym->name == NULL)
+	    goto error_return;
+				  
 	  h = bfd_link_hash_lookup (info->hash, arsym->name,
 				    FALSE, FALSE, TRUE);