From c1a8a5de13776c1a7b1bdbef574dd47948f77372 Mon Sep 17 00:00:00 2001
From: Nils Larsch <nils@openssl.org>
Date: Fri, 29 Apr 2005 21:20:31 +0000
Subject: [PATCH] don't let BN_CTX_free(NULL) segfault

---
 crypto/bn/bn_ctx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/crypto/bn/bn_ctx.c b/crypto/bn/bn_ctx.c
index 701019303..b3452f1a9 100644
--- a/crypto/bn/bn_ctx.c
+++ b/crypto/bn/bn_ctx.c
@@ -230,7 +230,10 @@ BN_CTX *BN_CTX_new(void)
 
 void BN_CTX_free(BN_CTX *ctx)
 	{
+	if (ctx == NULL)
+		return;
 #ifdef BN_CTX_DEBUG
+	{
 	BN_POOL_ITEM *pool = ctx->pool.head;
 	fprintf(stderr,"BN_CTX_free, stack-size=%d, pool-bignums=%d\n",
 		ctx->stack.size, ctx->pool.size);
@@ -242,6 +245,7 @@ void BN_CTX_free(BN_CTX *ctx)
 		pool = pool->next;
 	}
 	fprintf(stderr,"\n");
+	}
 #endif
 	BN_STACK_finish(&ctx->stack);
 	BN_POOL_finish(&ctx->pool);