PR: 2385

Submitted by: Stefan Birrer <stefan.birrer@adnovum.ch>
Reviewed by: steve

Zero key->pkey.ptr after it is freed so the structure can be reused.

crypto/evp/p_lib.c

@@ -411,7 +411,10 @@ void EVP_PKEY_free(EVP_PKEY *x)
 static void EVP_PKEY_free_it(EVP_PKEY *x)
 	{
 	if (x->ameth && x->ameth->pkey_free)
+		{
 		x->ameth->pkey_free(x);
+		x->pkey.ptr = NULL;
+		}
 #ifndef OPENSSL_NO_ENGINE
 	if (x->engine)
 		{