From 5904d78fbea85c481dc595df1e279f068acf6d12 Mon Sep 17 00:00:00 2001
From: Doug Hogan <hogand@users.noreply.github.com>
Date: Mon, 7 Jan 2019 06:44:06 -0800
Subject: Revamp evp_md_ctx_dtor()

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

(limited to 'lib')

diff --git a/lib/crypto/c_src/hash.c b/lib/crypto/c_src/hash.c
index 52748dc933..c8835296ea 100644
--- a/lib/crypto/c_src/hash.c
+++ b/lib/crypto/c_src/hash.c
@@ -34,7 +34,11 @@ struct evp_md_ctx {
 static ErlNifResourceType* evp_md_ctx_rtype;
 
 static void evp_md_ctx_dtor(ErlNifEnv* env, struct evp_md_ctx *ctx) {
-    EVP_MD_CTX_free(ctx->ctx);
+    if (ctx == NULL)
+        return;
+
+    if (ctx->ctx)
+        EVP_MD_CTX_free(ctx->ctx);
 }
 #endif
 
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