[6.0] dcbe8b9eb Mark req doclose when failing to ignore req body

[Martin Blix Grydeland]

commit dcbe8b9ebf5b352e2534fc5645afa1d9747e9647
Author: Martin Blix Grydeland <martin at varnish-software.com>
Date:   Fri Dec 17 22:10:16 2021 +0100

    Mark req doclose when failing to ignore req body
    
    Previously we would ignore errors to iterate the request body into
    oblivion in VRB_Ignore(), keeping the connection open. This opens an
    out-of-sync vulnerability on H/1 connections.
    
    This patch tests the status of the request body in VRB_Ignore(), marking
    the request failed and that it should be closed on errors.

diff --git a/bin/varnishd/cache/cache_req_body.c b/bin/varnishd/cache/cache_req_body.c
index 463b75b38..f289db07a 100644
--- a/bin/varnishd/cache/cache_req_body.c
+++ b/bin/varnishd/cache/cache_req_body.c
@@ -254,6 +254,8 @@ VRB_Ignore(struct req *req)
 	if (req->req_body_status == REQ_BODY_WITH_LEN ||
 	    req->req_body_status == REQ_BODY_WITHOUT_LEN)
 		(void)VRB_Iterate(req, httpq_req_body_discard, NULL);
+	if (req->req_body_status == REQ_BODY_FAIL)
+		req->doclose = SC_RX_BODY;
 	return(0);
 }