File wpa_supplicant-bnc-1099835-clear-default_passwd_cb.patch of Package wpa_supplicant.8265

commit 89971d8b1e328a2f79699c953625d1671fd40384
Author: Jouni Malinen <j@w1.fi>
Date:   Mon Jul 17 12:06:17 2017 +0300

    OpenSSL: Clear default_passwd_cb more thoroughly
    
    Previously, the pointer to strdup passwd was left in OpenSSL library
    default_passwd_cb_userdata and even the default_passwd_cb was left set
    on an error path. To avoid unexpected behavior if something were to
    manage to use there pointers, clear them explicitly once done with
    loading of the private key.
    
    Signed-off-by: Jouni Malinen <j@w1.fi>

diff --git a/src/crypto/tls_openssl.c b/src/crypto/tls_openssl.c
index c790b53ea..903c38cff 100644
--- a/src/crypto/tls_openssl.c
+++ b/src/crypto/tls_openssl.c
@@ -2775,6 +2775,19 @@ static int tls_connection_engine_private_key(struct tls_connection *conn)
 }
 
 
+static void tls_clear_default_passwd_cb(SSL_CTX *ssl_ctx, SSL *ssl)
+{
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
+	if (ssl) {
+		SSL_set_default_passwd_cb(ssl, NULL);
+		SSL_set_default_passwd_cb_userdata(ssl, NULL);
+	}
+#endif /* >= 1.1.0f && !LibreSSL */
+	SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
+	SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, NULL);
+}
+
+
 static int tls_connection_private_key(struct tls_data *data,
 				      struct tls_connection *conn,
 				      const char *private_key,
@@ -2891,14 +2904,12 @@ static int tls_connection_private_key(struct tls_data *data,
 	if (!ok) {
 		tls_show_errors(MSG_INFO, __func__,
 				"Failed to load private key");
+		tls_clear_default_passwd_cb(ssl_ctx, conn->ssl);
 		os_free(passwd);
 		return -1;
 	}
 	ERR_clear_error();
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
-	SSL_set_default_passwd_cb(conn->ssl, NULL);
-#endif /* >= 1.1.0f && !LibreSSL */
-	SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
+	tls_clear_default_passwd_cb(ssl_ctx, conn->ssl);
 	os_free(passwd);
 
 	if (!SSL_check_private_key(conn->ssl)) {
@@ -2941,13 +2952,14 @@ static int tls_global_private_key(struct tls_data *data,
 	    tls_read_pkcs12(data, NULL, private_key, passwd)) {
 		tls_show_errors(MSG_INFO, __func__,
 				"Failed to load private key");
+		tls_clear_default_passwd_cb(ssl_ctx, NULL);
 		os_free(passwd);
 		ERR_clear_error();
 		return -1;
 	}
+	tls_clear_default_passwd_cb(ssl_ctx, NULL);
 	os_free(passwd);
 	ERR_clear_error();
-	SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
 
 	if (!SSL_CTX_check_private_key(ssl_ctx)) {
 		tls_show_errors(MSG_INFO, __func__,