re PR tree-optimization/82977 (AddressSanitizer: heap-use-after-free in…

re PR tree-optimization/82977 (AddressSanitizer: heap-use-after-free in strlen_optimize_stmt .././../gcc/tree-ssa-strlen.c:2971)

	PR tree-optimization/82977
	* tree-ssa-strlen.c (strlen_optimize_stmt): Pass a reference to a copy
	constructed temporary to strlen_to_stridx.put.

From-SVN: r254757

gcc/ChangeLog

+2017-11-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/82977
+	* tree-ssa-strlen.c (strlen_optimize_stmt): Pass a reference to a copy
+	constructed temporary to strlen_to_stridx.put.
+
 2017-11-15  Martin Liska  <mliska@suse.cz>
 
 	* configure.ac: Remove -fkeep-inline-functions from coverage_flags.

gcc/tree-ssa-strlen.c

@@ -2968,7 +2968,7 @@ strlen_optimize_stmt (gimple_stmt_iterator *gsi)
 
 	tree rhs1 = gimple_assign_rhs1 (stmt);
 	if (stridx_strlenloc *ps = strlen_to_stridx.get (rhs1))
-	  strlen_to_stridx.put (lhs, *ps);
+	  strlen_to_stridx.put (lhs, stridx_strlenloc (*ps));
       }
     else if (TREE_CODE (lhs) != SSA_NAME && !TREE_SIDE_EFFECTS (lhs))
 	{