From 7736c30033eaf9b4399f46be6b7b81c4fef16d22 Mon Sep 17 00:00:00 2001
From: Richard Barnes <rlb@ipv.sx>
Date: Mon, 21 Nov 2022 11:46:50 -0500
Subject: [PATCH] Respect the direction set in a template stream

---
 srtp/srtp.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/srtp/srtp.c b/srtp/srtp.c
index c47830b2a..4b1340ae1 100644
--- a/srtp/srtp.c
+++ b/srtp/srtp.c
@@ -2137,7 +2137,7 @@ srtp_err_status_t srtp_protect_mki(srtp_ctx_t *ctx,
      */
     stream = srtp_get_stream(ctx, hdr->ssrc);
     if (stream == NULL) {
-        if (ctx->stream_template != NULL) {
+        if ((ctx->stream_template != NULL) && (ctx->stream_template->direction != dir_srtp_receiver)) {
             srtp_stream_ctx_t *new_stream;
 
             /* allocate and initialize a new stream */
@@ -2465,6 +2465,10 @@ srtp_err_status_t srtp_unprotect_mki(srtp_ctx_t *ctx,
     stream = srtp_get_stream(ctx, hdr->ssrc);
     if (stream == NULL) {
         if (ctx->stream_template != NULL) {
+            if (ctx->stream_template->direction == dir_srtp_sender) {
+                return srtp_err_status_no_ctx;
+            }
+
             stream = ctx->stream_template;
             debug_print(mod_srtp, "using provisional stream (SSRC: 0x%08x)",
                         ntohl(hdr->ssrc));