From 2a5450809a4f734d64251bf544c07ad83ca1ba31 Mon Sep 17 00:00:00 2001
From: otto <>
Date: Thu, 21 Aug 2003 08:14:19 +0000
Subject: Do not produce a corrupt BIGNUM when adding 0 to 0 using
 BN_add_word(). ok markus@

---
 src/lib/libcrypto/bn/bn_word.c         | 3 +++
 src/lib/libssl/src/crypto/bn/bn_word.c | 3 +++
 2 files changed, 6 insertions(+)

(limited to 'src')

diff --git a/src/lib/libcrypto/bn/bn_word.c b/src/lib/libcrypto/bn/bn_word.c
index 988e0ca7b3..ab858d70ff 100644
--- a/src/lib/libcrypto/bn/bn_word.c
+++ b/src/lib/libcrypto/bn/bn_word.c
@@ -110,6 +110,9 @@ int BN_add_word(BIGNUM *a, BN_ULONG w)
 	BN_ULONG l;
 	int i;
 
+	if ((w & BN_MASK2) == 0)
+		return(1);
+
 	if (a->neg)
 		{
 		a->neg=0;
diff --git a/src/lib/libssl/src/crypto/bn/bn_word.c b/src/lib/libssl/src/crypto/bn/bn_word.c
index 988e0ca7b3..ab858d70ff 100644
--- a/src/lib/libssl/src/crypto/bn/bn_word.c
+++ b/src/lib/libssl/src/crypto/bn/bn_word.c
@@ -110,6 +110,9 @@ int BN_add_word(BIGNUM *a, BN_ULONG w)
 	BN_ULONG l;
 	int i;
 
+	if ((w & BN_MASK2) == 0)
+		return(1);
+
 	if (a->neg)
 		{
 		a->neg=0;
-- 
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