From: Roman Arutyunyan <arut@nginx.com>
Date: Thu, 3 Feb 2022 18:29:05 +0000 (+0300)
Subject: QUIC: improved size calculation in ngx_quic_write_chain().
X-Git-Tag: release-1.25.0~4^2~107
X-Git-Url: http://git.kaiwu.me/postgresql/log/contrib/postgres_fdw/postgres_fdw.c?a=commitdiff_plain;h=1cc2be9616bd9117778d3576dcf3112eb93da4e3;p=nginx.git

QUIC: improved size calculation in ngx_quic_write_chain().

Previously, size was calculated based on the number of input bytes processed
by the function.  Now only the copied bytes are considered.  This prevents
overlapping buffers from contributing twice to the overall written size.
---

diff --git a/src/event/quic/ngx_event_quic_frames.c b/src/event/quic/ngx_event_quic_frames.c
index 951b6e8a2..4fa6c56c5 100644
--- a/src/event/quic/ngx_event_quic_frames.c
+++ b/src/event/quic/ngx_event_quic_frames.c
@@ -554,16 +554,16 @@ ngx_quic_write_chain(ngx_connection_t *c, ngx_chain_t **chain, ngx_chain_t *in,
 
             if (b->sync) {
                 ngx_memcpy(p, in->buf->pos, n);
+
+                if (size) {
+                    *size += n;
+                }
             }
 
             p += n;
             in->buf->pos += n;
             offset += n;
             limit -= n;
-
-            if (size) {
-                *size += n;
-            }
         }
 
         if (b->sync && p == b->last) {