From 82bf227e9170e144ca143af3d4b970c1500d0884 Mon Sep 17 00:00:00 2001
From: Richard Levitte <levitte@openssl.org>
Date: Wed, 7 Feb 2007 01:42:46 +0000
Subject: [PATCH] After objects have been freed, NULLify the pointers so there
 will be no double free of those objects

---
 crypto/x509/x509_vfy.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/crypto/x509/x509_vfy.c b/crypto/x509/x509_vfy.c
index d8ed30a9e8..ba2c3836f5 100644
--- a/crypto/x509/x509_vfy.c
+++ b/crypto/x509/x509_vfy.c
@@ -1598,9 +1598,16 @@ void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
 	{
 	if (ctx->cleanup) ctx->cleanup(ctx);
-	X509_VERIFY_PARAM_free(ctx->param);
-	if (ctx->tree)
+	if (ctx->param != NULL)
+		{
+		X509_VERIFY_PARAM_free(ctx->param);
+		ctx->param=NULL;
+		}
+	if (ctx->tree != NULL)
+		{
 		X509_policy_tree_free(ctx->tree);
+		ctx->tree=NULL;
+		}
 	if (ctx->chain != NULL)
 		{
 		sk_X509_pop_free(ctx->chain,X509_free);
-- 
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