From c6223f04e5580b6affc19d5f7518c523814b7da8 Mon Sep 17 00:00:00 2001
From: otto <>
Date: Thu, 25 Sep 2003 19:55:36 +0000
Subject: Return immediately if argument to BN_sub_word is zero.

ok markus@ deraadt@
---
 src/lib/libssl/src/crypto/bn/bn_word.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/lib/libssl')

diff --git a/src/lib/libssl/src/crypto/bn/bn_word.c b/src/lib/libssl/src/crypto/bn/bn_word.c
index ab858d70ff..de610ce54c 100644
--- a/src/lib/libssl/src/crypto/bn/bn_word.c
+++ b/src/lib/libssl/src/crypto/bn/bn_word.c
@@ -146,6 +146,9 @@ int BN_sub_word(BIGNUM *a, BN_ULONG w)
 	{
 	int i;
 
+	if ((w & BN_MASK2) == 0)
+		return(1);
+
 	if (BN_is_zero(a) || a->neg)
 		{
 		a->neg=0;
-- 
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