From 299a78c5fed3447a450cea3d4f686c2140c7aaed Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Fri, 12 Nov 2010 20:21:50 -0500
Subject: Make crypto_free_pk_env tolerate NULL arg in 0.2.1.  Error-proofing
 against bug 988 backport

---
 src/common/crypto.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/common/crypto.c b/src/common/crypto.c
index dffa2c7807..c723c33dd0 100644
--- a/src/common/crypto.c
+++ b/src/common/crypto.c
@@ -321,7 +321,8 @@ crypto_new_pk_env(void)
 void
 crypto_free_pk_env(crypto_pk_env_t *env)
 {
-  tor_assert(env);
+  if (!env)
+    return;
 
   if (--env->refs > 0)
     return;
-- 
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