Eliminate 'null dereference' code defect warning in register_finalizer

* finalize.c (GC_register_finalizer_inner): Add GC_ASSERT that fn is
non-zero (instead of specifying this in a comment) for the case when
new_fo is non-NULL (new_fo is returned by GC_oom_fn).
* finalize.c [LINT2] (GC_register_finalizer_inner): Call ABORT if hhdr
is NULL (for the case when new_fo is non-NULL).

diff --git a/finalize.c b/finalize.c
index 3de2a9c..c765d62 100644 (file)
--- a/finalize.c
+++ b/finalize.c
@@ -699,7 +699,11 @@ STATIC void GC_register_finalizer_inner(void * obj,
         curr_fo = fo_next(curr_fo);
       }
       if (EXPECT(new_fo != 0, FALSE)) {
-        /* new_fo is returned by GC_oom_fn(), so fn != 0 and hhdr != 0. */
+        /* new_fo is returned by GC_oom_fn().   */
+        GC_ASSERT(fn != 0);
+#       ifdef LINT2
+          if (NULL == hhdr) ABORT("Bad hhdr in GC_register_finalizer_inner");
+#       endif
         break;
       }
       if (fn == 0) {