[Patch] MdeModulePkg/DxeNetLib: Allow the IPv4/prefix case when AsciiStrToIp4

[Jiaxin Wu <jiaxin.wu@intel.com>]

This patch is used to allow the IPv4 with prefix case.

Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Zhang Lubo <lubo.zhang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
---
 MdeModulePkg/Library/DxeNetLib/DxeNetLib.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c b/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c
index 04d8345..0804052 100644
--- a/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c
+++ b/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c
@@ -2722,13 +2722,21 @@ NetLibAsciiStrToIp4 (
 
   for (Index = 0; Index < 4; Index++) {
     TempStr = Ip4Str;
 
     while ((*Ip4Str != '\0') && (*Ip4Str != '.')) {
-      if (!NET_IS_DIGIT (*Ip4Str)) {
+      if (Index != 3 && !NET_IS_DIGIT (*Ip4Str)) {
         return EFI_INVALID_PARAMETER;
       }
+      
+      //
+      // Allow the IPv4 with prefix case, e.g. 192.168.10.10/24 
+      //
+      if (Index == 3 && !NET_IS_DIGIT (*Ip4Str) && *Ip4Str != '/') {
+        return EFI_INVALID_PARAMETER;
+      }
+      
       Ip4Str++;
     }
 
     //
     // The IPv4 address is X.X.X.X
-- 
1.9.5.msysgit.1