[master] 83c5ead Tolerate an empty status line elements in case we've run out of ws handling an error

[Nils Goroll]

commit 83c5ead8ff1563823c91eb00c6394b3720911853
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Mon Jun 27 14:52:07 2016 +0200

    Tolerate an empty status line elements in case we've run out of ws handling an error
    
    When handling a fetch error we may not even have had memory to store
    the status code.
    
    Fixes #1990

diff --git a/bin/varnishd/cache/cache_http.c b/bin/varnishd/cache/cache_http.c
index 3efd78a..d6bfb28 100644
--- a/bin/varnishd/cache/cache_http.c
+++ b/bin/varnishd/cache/cache_http.c
@@ -796,6 +796,8 @@ http_EstimateWS(const struct http *fm, unsigned how)
 	for (u = 0; u < fm->nhd; u++) {
 		if (u == HTTP_HDR_METHOD || u == HTTP_HDR_URL)
 			continue;
+		if (u < HTTP_HDR_FIRST && fm->hd[u].b == NULL)
+			continue;
 		Tcheck(fm->hd[u]);
 		if (fm->hdf[u] & HDF_FILTER)
 			continue;