commit 62aa64e5aea21dd969db97aded4443c98c0735ac
Author: Eric Covener <covener@apache.org>
Date:   Mon Jun 24 17:51:42 2024 +0000

    Merge r1918548 from trunk:
    
    mod_http2: early exit if bb is null
    
    
    
    git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1918557 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/modules/http2/h2_c2.c b/modules/http2/h2_c2.c
index a955200944..c65a521ab8 100644
--- a/modules/http2/h2_c2.c
+++ b/modules/http2/h2_c2.c
@@ -370,6 +370,13 @@ static apr_status_t h2_c2_filter_out(ap_filter_t* f, apr_bucket_brigade* bb)
     h2_conn_ctx_t *conn_ctx = h2_conn_ctx_get(f->c);
     apr_status_t rv;
 
+   if (bb == NULL) {
+#if !AP_MODULE_MAGIC_AT_LEAST(20180720, 1)
+        f->c->data_in_output_filters = 0;
+#endif
+        return APR_SUCCESS;
+    }
+
     ap_assert(conn_ctx);
 #if AP_HAS_RESPONSE_BUCKETS
     if (!conn_ctx->has_final_response) {