From 08b375d7500f03d6d42b59549fb919e92dd25b36 Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Thu, 19 Jan 2023 17:50:18 +0800
Subject: [PATCH] fix(rpc): don't parse msgpack if buflen is 0

This prevents `buflen` from becoming a very large number when it is 0
when calling mpack_rtoken().

(cherry picked from commit 266f42ed8b75554c313c8665cf77eb4c6734735e)
---
 src/mpack/mpack_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mpack/mpack_core.c b/src/mpack/mpack_core.c
index 4ee67a032a..3424f444b9 100644
--- a/src/mpack/mpack_core.c
+++ b/src/mpack/mpack_core.c
@@ -173,6 +173,9 @@ MPACK_API int mpack_write(mpack_tokbuf_t *tokbuf, char **buf, size_t *buflen,
 
 int mpack_rtoken(const char **buf, size_t *buflen, mpack_token_t *tok)
 {
+  if (*buflen == 0) {
+    return MPACK_EOF;
+  }
   unsigned char t = ADVANCE(buf, buflen);
   if (t < 0x80) {
     /* positive fixint */