From 46a101341ecb4cb800e685f5c1897ed474c4ab7b Mon Sep 17 00:00:00 2001
From: Doug Hogan <hogand@users.noreply.github.com>
Date: Mon, 7 Jan 2019 06:43:10 -0800
Subject: Revamp evp_cipher_ctx_dtor()

Make it NULL safe.
---
 lib/crypto/c_src/cipher.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'lib/crypto/c_src/cipher.c')

diff --git a/lib/crypto/c_src/cipher.c b/lib/crypto/c_src/cipher.c
index 6580cb183f..cda9b15291 100644
--- a/lib/crypto/c_src/cipher.c
+++ b/lib/crypto/c_src/cipher.c
@@ -74,7 +74,11 @@ static struct cipher_type_t cipher_types[] =
 ErlNifResourceType* evp_cipher_ctx_rtype;
 
 static void evp_cipher_ctx_dtor(ErlNifEnv* env, struct evp_cipher_ctx* ctx) {
-    EVP_CIPHER_CTX_free(ctx->ctx);
+    if (ctx == NULL)
+        return;
+
+    if (ctx->ctx)
+        EVP_CIPHER_CTX_free(ctx->ctx);
 }
 #endif
 
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