[nginx] HTTP/3: fixed NGX_HTTP_V3_VARLEN_INT_LEN value.

[noreply at nginx.com]

details:   https://github.com/nginx/nginx/commit/55be5536a8fa4dba3ef687db2532ac96bd879b2b
branches:  stable-1.28
commit:    55be5536a8fa4dba3ef687db2532ac96bd879b2b
user:      Roman Arutyunyan <arut at nginx.com>
date:      Fri, 18 Apr 2025 11:16:57 +0400
description:
HTTP/3: fixed NGX_HTTP_V3_VARLEN_INT_LEN value.

After fixing ngx_http_v3_encode_varlen_int() in 400eb1b628,
NGX_HTTP_V3_VARLEN_INT_LEN retained the old value of 4, which is
insufficient for the values over 1073741823 (1G - 1).

The NGX_HTTP_V3_VARLEN_INT_LEN macro is used in ngx_http_v3_uni.c to
format stream and frame types.  Old buffer size is enough for formatting
this data.  Also, the macro is used in ngx_http_v3_filter_module.c to
format output chunks and trailers.  Considering output_buffers and
proxy_buffer_size are below 1G in all realistic scenarios, the old buffer
size is enough here as well.

---
 src/http/v3/ngx_http_v3.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/http/v3/ngx_http_v3.h b/src/http/v3/ngx_http_v3.h
index 9dcb5e6a7..8fd212c1f 100644
--- a/src/http/v3/ngx_http_v3.h
+++ b/src/http/v3/ngx_http_v3.h
@@ -23,7 +23,7 @@
 #define NGX_HTTP_V3_HQ_ALPN_PROTO                  "\x0Ahq-interop"
 #define NGX_HTTP_V3_HQ_PROTO                       "hq-interop"
 
-#define NGX_HTTP_V3_VARLEN_INT_LEN                 4
+#define NGX_HTTP_V3_VARLEN_INT_LEN                 8
 #define NGX_HTTP_V3_PREFIX_INT_LEN                 11
 
 #define NGX_HTTP_V3_STREAM_CONTROL                 0x00