Initialize unused value when specializing to cdata metatable.

Reported by jakitliang. #1354

1 files changed, 4 insertions, 1 deletions

diff --git a/src/lj_record.c b/src/lj_record.c
index 20a7ea36..d336f642 100644
--- a/src/lj_record.c
+++ b/src/lj_record.c
@@ -854,7 +854,10 @@ int lj_record_mm_lookup(jit_State *J, RecordIndex *ix, MMS mm)
       return 0;  /* No metamethod. */
     }
     /* The cdata metatable is treated as immutable. */
-    if (LJ_HASFFI && tref_iscdata(ix->tab)) goto immutable_mt;
+    if (LJ_HASFFI && tref_iscdata(ix->tab)) {
+      mix.tab = TREF_NIL;
+      goto immutable_mt;
+    }
     ix->mt = mix.tab = lj_ir_ktab(J, mt);
     goto nocheck;
   }