1 files changed, 23 insertions, 4 deletions

diff --git a/src/bytecode.c b/src/bytecode.c
index d887668dd39..01ae8055ebf 100644
--- a/src/bytecode.c
+++ b/src/bytecode.c
@@ -425,7 +425,7 @@ according to which any remaining arguments are pushed on the stack
 before executing BYTESTR.
 
 usage: (byte-code BYTESTR VECTOR MAXDEP &optional ARGS-TEMPLATE &rest ARGS) */)
-     (int nargs, Lisp_Object *args)
+     (size_t nargs, Lisp_Object *args)
 {
   Lisp_Object args_tmpl = nargs >= 4 ? args[3] : Qnil;
   int pnargs = nargs >= 4 ? nargs - 4 : 0;
@@ -631,7 +631,16 @@ exec_byte_code (Lisp_Object bytestr, Lisp_Object vector, Lisp_Object maxdepth,
           {
             Lisp_Object v1;
             v1 = TOP;
-            TOP = CAR (v1);
+            if (CONSP (v1))
+              TOP = XCAR (v1);
+            else if (NILP (v1))
+              TOP = Qnil;
+            else
+              {
+                BEFORE_POTENTIAL_GC ();
+                wrong_type_argument (Qlistp, v1);
+                AFTER_POTENTIAL_GC ();
+              }
             break;
           }
 
@@ -657,7 +666,17 @@ exec_byte_code (Lisp_Object bytestr, Lisp_Object vector, Lisp_Object maxdepth,
           {
             Lisp_Object v1;
             v1 = TOP;
-            TOP = CDR (v1);
+            if (CONSP (v1))
+              TOP = XCDR (v1);
+            else if (NILP (v1))
+              TOP = Qnil;
+            else
+              {
+                BEFORE_POTENTIAL_GC ();
+                wrong_type_argument (Qlistp, v1);
+                AFTER_POTENTIAL_GC ();
+              }
+            break;
             break;
           }
 
@@ -994,13 +1013,13 @@ exec_byte_code (Lisp_Object bytestr, Lisp_Object vector, Lisp_Object maxdepth,
             v1 = POP;
             v2 = TOP;
             CHECK_NUMBER (v2);
-            AFTER_POTENTIAL_GC ();
             op = XINT (v2);
             immediate_quit = 1;
             while (--op >= 0 && CONSP (v1))
               v1 = XCDR (v1);
             immediate_quit = 0;
             TOP = CAR (v1);
+            AFTER_POTENTIAL_GC ();
             break;
           }