From: Daniel Stenberg <daniel@haxx.se>
Date: Tue, 26 Apr 2016 21:55:31 +0000 (+0200)
Subject: openssl: avoid BN_print a NULL bignum
X-Git-Tag: curl-7_49_0~78
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab691309cee98d0cd5d7a44d8c8d514de6dfce66;p=thirdparty%2Fcurl.git

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 e9acf9a03f..2d18b1bc49 100644
--- 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);
 }