1 files changed, 16 insertions, 0 deletions

diff --git a/src/lib/libcrypto/bio/bf_null.c b/src/lib/libcrypto/bio/bf_null.c
index 3254a55dce..0d183a6d9a 100644
--- a/src/lib/libcrypto/bio/bf_null.c
+++ b/src/lib/libcrypto/bio/bf_null.c
@@ -72,6 +72,7 @@ static int nullf_gets(BIO *h,char *str,int size);
 static long nullf_ctrl(BIO *h,int cmd,long arg1,char *arg2);
 static int nullf_new(BIO *h);
 static int nullf_free(BIO *data);
+static long nullf_callback_ctrl(BIO *h,int cmd,void (*fp)());
 static BIO_METHOD methods_nullf=
         {
         BIO_TYPE_NULL_FILTER,
@@ -83,6 +84,7 @@ static BIO_METHOD methods_nullf=
         nullf_ctrl,
         nullf_new,
         nullf_free,
+        nullf_callback_ctrl,
         };
 
 BIO_METHOD *BIO_f_null(void)
@@ -152,6 +154,20 @@ static long nullf_ctrl(BIO *b, int cmd, long num, char *ptr)
         return(ret);
         }
 
+static long nullf_callback_ctrl(BIO *b, int cmd, void (*fp)())
+        {
+        long ret=1;
+
+        if (b->next_bio == NULL) return(0);
+        switch (cmd)
+                {
+        default:
+                ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
+                break;
+                }
+        return(ret);
+        }
+
 static int nullf_gets(BIO *bp, char *buf, int size)
         {
         if (bp->next_bio == NULL) return(0);