1 files changed, 2 insertions, 0 deletions
diff --git a/exec/exec.c b/exec/exec.c
index f5995ac5..d78c54c5 100644
--- a/exec/exec.c
+++ b/exec/exec.c
@@ -773,6 +773,8 @@ servercopy (void *arg, mach_msg_type_number_t argsize, boolean_t argcopy,
 {
   if (! argcopy)
     return arg;
+  if (! argsize)
+    return NULL;
 
   /* ARG came in-line, so we must copy it.  */
   void *copy;