# HG changeset patch
# User Sergey Kandaurov <pluknet@nginx.com>
# Date 1622536898 -10800
# Node ID 3509b9dcfb47646a66b17e975c7538e11390b344
# Parent  f0882db8c8d445e294b976ea44f3419f46bafb35
HTTP/3: fixed parsing encoder insertions with empty header value.

When starting processing a new encoder instruction, the header state is not
memzero'ed because generally it's burdensome.  If the header value is empty,
this resulted in inserting a stale value left from the previous instruction.

Based on a patch by Zhiyong Sun.

diff --git a/src/http/v3/ngx_http_v3_parse.c b/src/http/v3/ngx_http_v3_parse.c
--- a/src/http/v3/ngx_http_v3_parse.c
+++ b/src/http/v3/ngx_http_v3_parse.c
@@ -1366,6 +1366,7 @@ ngx_http_v3_parse_header_inr(ngx_connect
 
         st->literal.length = st->pint.value;
         if (st->literal.length == 0) {
+            st->value.len = 0;
             goto done;
         }
 
@@ -1470,6 +1471,7 @@ ngx_http_v3_parse_header_iwnr(ngx_connec
 
         st->literal.length = st->pint.value;
         if (st->literal.length == 0) {
+            st->value.len = 0;
             goto done;
         }