1 files changed, 3 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bn/bn_lib.c b/src/lib/libcrypto/bn/bn_lib.c
index 0b79a87413..0025cf52ef 100644
--- a/src/lib/libcrypto/bn/bn_lib.c
+++ b/src/lib/libcrypto/bn/bn_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_lib.c,v 1.45 2018/07/23 18:14:32 tb Exp $ */
+/* $OpenBSD: bn_lib.c,v 1.46 2019/03/23 18:48:15 beck Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -578,6 +578,8 @@ BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret)
         BN_ULONG l;
         BIGNUM *bn = NULL;
 
+        if (len < 0)
+                return (NULL);
         if (ret == NULL)
                 ret = bn = BN_new();
         if (ret == NULL)