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
index 5ccb363601a3134fce75c2de55389ee7e8243506..79c4f17c204693f5e61377a382e8ed4a4f98d1cd 100644 (file)
--- 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_http_request_t *r, u_char *pos,
                 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);