# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1630417453 -10800
# Node ID 29795b697e140b3b016cfbc5f0e37be779295b45
# Parent  09d15a2dbc6bf534c7b20b63c05ffaa46526606b
HTTP/2: avoid memcpy() with NULL source and zero length.

Prodded by Clang Static Analyzer.

diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c
@@ -4241,7 +4241,9 @@ ngx_http_v2_process_request_body(ngx_htt
                 n = size;
             }
 
-            rb->buf->last = ngx_cpymem(rb->buf->last, pos, n);
+            if (n > 0) {
+                rb->buf->last = ngx_cpymem(rb->buf->last, pos, n);
+            }
 
             ngx_log_debug1(NGX_LOG_DEBUG_HTTP, fc->log, 0,
                            "http2 request body recv %uz", n);