Index: subversion/mod_dav_svn/update.c
===================================================================
--- subversion/mod_dav_svn/update.c	(revision 19716)
+++ subversion/mod_dav_svn/update.c	(working copy)
@@ -371,6 +371,9 @@
   struct brigade_write_baton *wb = baton;
   apr_status_t apr_err;
 
+  if (wb->output->c->aborted)
+    return svn_error_create(APR_EINVAL, "Connection aborted");
+
   apr_err = apr_brigade_write(wb->bb, ap_filter_flush, wb->output, data, *len);
 
   if (apr_err != APR_SUCCESS)