openssl: avoid BN_print a NULL bignum

OpenSSL 1.1.0-pre seems to return NULL(?) for a whole lot of those
numbers so make sure the function handles this.

Reported-by: Linus Nordberg

diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
index e9acf9a03f6b7f26cb070bff09ce39766acccadf..2d18b1bc493e23a32be58597d7275fb29f0166e9 100644 (file)
--- a/lib/vtls/openssl.c
+++ b/lib/vtls/openssl.c
@@ -2228,7 +2228,8 @@ static void pubkey_show(struct SessionHandle *data,
 
   snprintf(namebuf, sizeof(namebuf), "%s(%s)", type, name);
 
-  BN_print(mem, bn);
+  if(bn)
+    BN_print(mem, bn);
   push_certinfo(namebuf, num);
 }