[PATCH V3] NetworkPkg: Correct the length of EAP Identity when in ASCII format

["Li, Yi" <yi1.li@intel.com>]

FIX: https://bugzilla.tianocore.org/show_bug.cgi?id=4477

Tls connection fail over WiFi in AMT OCR flow due to invalid identity.

This was due to missing conversion between unicode and ascii
string which resulted in invalid strlen.

Cc: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Cc: Zachary Clark-Williams <zachary.clark-williams@intel.com>
Signed-off-by: Yi Li <yi1.li@intel.com>
---
 .../WifiConnectionMgrImpl.c                   | 21 +++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/NetworkPkg/WifiConnectionManagerDxe/WifiConnectionMgrImpl.c b/NetworkPkg/WifiConnectionManagerDxe/WifiConnectionMgrImpl.c
index 2e596c1981..d1182e52bd 100644
--- a/NetworkPkg/WifiConnectionManagerDxe/WifiConnectionMgrImpl.c
+++ b/NetworkPkg/WifiConnectionManagerDxe/WifiConnectionMgrImpl.c
@@ -572,15 +572,28 @@ WifiMgrConfigEap (
   // Set Identity to Eap peer, Mandatory field for PEAP and TTLS
   //
   if (StrLen (Profile->EapIdentity) > 0) {
-    IdentitySize = sizeof (CHAR8) * (StrLen (Profile->EapIdentity) + 1);
-    Identity     = AllocateZeroPool (IdentitySize);
+    Status = gBS->LocateProtocol (&gEdkiiWiFiProfileSyncProtocolGuid, NULL, (VOID **)&WiFiProfileSyncProtocol);
+    if (!EFI_ERROR (Status)) {
+      //
+      // Max size of EapIdentity ::= sizeof (CHAR16) * sizeof (Profile->EapIdentity) ::= 2 * EAP_IDENTITY_SIZE
+      //
+      IdentitySize = sizeof (CHAR8) * (AsciiStrnLenS ((CHAR8 *)Profile->EapIdentity, sizeof (CHAR16) * sizeof (Profile->EapIdentity)) + 1);
+    } else {
+      IdentitySize = sizeof (CHAR8) * (StrLen (Profile->EapIdentity) + 1);
+    }
+
+    Identity = AllocateZeroPool (IdentitySize);
     if (Identity == NULL) {
       return EFI_OUT_OF_RESOURCES;
     }
 
-    Status = gBS->LocateProtocol (&gEdkiiWiFiProfileSyncProtocolGuid, NULL, (VOID **)&WiFiProfileSyncProtocol);
     if (!EFI_ERROR (Status)) {
-      CopyMem (Identity, &Profile->EapIdentity, IdentitySize);
+      //
+      // The size of Identity from Username may equal
+      // to the max size of EapIdentity(EAP_IDENTITY_SIZE*2=128 bytes),
+      // so here only valid characters except NULL characters are copied.
+      //
+      CopyMem (Identity, &Profile->EapIdentity, IdentitySize - 1);
     } else {
       UnicodeStrToAsciiStrS (Profile->EapIdentity, Identity, IdentitySize);
     }
-- 
2.31.1.windows.1