SSL_set_app_data is a macro for SSL_set_ex_data(), which is a wrapper

around CRYPTO_set_ex_data(), which can fail. Since this is the case, check
the return value of CRYPTO_set_ex_data^WSSL_set_ex_data^WSSL_set_app_data.

1 files changed, 5 insertions, 3 deletions

diff --git a/src/lib/libtls/tls_client.c b/src/lib/libtls/tls_client.c
index 295e76c60d..442ba4321e 100644
--- a/src/lib/libtls/tls_client.c
+++ b/src/lib/libtls/tls_client.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tls_client.c,v 1.18 2015/08/22 14:40:25 jsing Exp $ */
+/* $OpenBSD: tls_client.c,v 1.19 2015/08/22 14:51:34 jsing Exp $ */
 /*
  * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
  *
@@ -225,8 +225,10 @@ tls_connect_fds(struct tls *ctx, int fd_read, int fd_write,
                 tls_set_error(ctx, "ssl connection failure");
                 goto err;
         }
-        SSL_set_app_data(ctx->ssl_conn, ctx);
-
+        if (SSL_set_app_data(ctx->ssl_conn, ctx) != 1) {
+                tls_set_error(ctx, "ssl application data failure");
+                goto err;
+        }
         if (SSL_set_rfd(ctx->ssl_conn, fd_read) != 1 ||
             SSL_set_wfd(ctx->ssl_conn, fd_write) != 1) {
                 tls_set_error(ctx, "ssl file descriptor failure");