From d82d59edb0ec23e6ef708e04a5553ac32f1eb12e Mon Sep 17 00:00:00 2001
From: Zhang Lubo <lubo.zhang@intel.com>
Date: Fri, 19 Aug 2016 15:38:20 +0800
Subject: [PATCH] MdeModulePkg:Fix bug in function AsciiStrToIp4.

If a FQDN contains 3 dots '.' like "a.b.c.com", the AsciiStrToIp4
will return success as the HostName has a valid IP address. So we
need to check if it is a decimal character before using AsciiStrDecimalToUintn.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Sriram Subramanian <sriram-s@hpe.com>
---
 MdeModulePkg/Library/DxeNetLib/DxeNetLib.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c b/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c
index ef19439a48..7700f0ff82 100644
--- a/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c
+++ b/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c
@@ -2726,6 +2726,9 @@ NetLibAsciiStrToIp4 (
     TempStr = Ip4Str;
 
     while ((*Ip4Str != '\0') && (*Ip4Str != '.')) {
+      if (!NET_IS_DIGIT (*Ip4Str)) {
+        return EFI_INVALID_PARAMETER;
+      }
       Ip4Str++;
     }
 
-- 
2.39.2