From 95b7221f15f8e338d5603dfa4db134817594c54a Mon Sep 17 00:00:00 2001
From: Egok4wryu <15806957625@163.com>
Date: Thu, 20 Oct 2022 11:13:26 +0800
Subject: [PATCH] add the annotation in the function of pg_md5_encrypt

---
 src/common/backend/libpq/md5.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/common/backend/libpq/md5.cpp b/src/common/backend/libpq/md5.cpp
index 9b8072e0f..f5af86993 100644
--- a/src/common/backend/libpq/md5.cpp
+++ b/src/common/backend/libpq/md5.cpp
@@ -309,6 +309,7 @@ bool pg_md5_encrypt(const char* passwd, const char* salt, size_t salt_len, char*
 {
     size_t passwd_len = strlen(passwd);
     errno_t rc = EOK;
+    /* the length of salt and password is <= SIZE_MAX */
 #ifndef WIN32
     if (unlikely(passwd_len >= SIZE_MAX - salt_len)) {
         return false;
@@ -322,6 +323,7 @@ bool pg_md5_encrypt(const char* passwd, const char* salt, size_t salt_len, char*
     char* crypt_buf = (char*)malloc(passwd_len + salt_len + 1);
     bool ret = false;
 
+    /* the buffer is not exist */
     if (crypt_buf == NULL)
         return false;