Handle SSL_do_handshake() being called before SSL_provide_quic_data().

If SSL_do_handshake() is called before SSL_provide_quic_data() has been
called, the QUIC read buffer will not have been initialised. In this case
we want to return TLS13_IO_WANT_POLLIN so that the QUIC stack will provide
handshake data.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/lib/libssl/tls13_quic.c b/src/lib/libssl/tls13_quic.c
index ceb666ac4c..92bbb011c8 100644
--- a/src/lib/libssl/tls13_quic.c
+++ b/src/lib/libssl/tls13_quic.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: tls13_quic.c,v 1.4 2022/08/21 19:39:44 jsing Exp $ */
+/*      $OpenBSD: tls13_quic.c,v 1.5 2022/08/27 09:12:55 jsing Exp $ */
 /*
  * Copyright (c) 2022 Joel Sing <jsing@openbsd.org>
  *
@@ -58,6 +58,9 @@ tls13_quic_handshake_read_cb(void *buf, size_t n, void *arg)
 {
         struct tls13_ctx *ctx = arg;
 
+        if (ctx->hs->tls13.quic_read_buffer == NULL)
+                return TLS13_IO_WANT_POLLIN;
+
         return tls_buffer_read(ctx->hs->tls13.quic_read_buffer, buf, n);
 }