From 75deaf5c3c0d164c61653258c331151241bb69d8 Mon Sep 17 00:00:00 2001
From: Doug Flick <dougflick@microsoft.com>
Date: Tue, 13 Feb 2024 10:46:02 -0800
Subject: NetworkPkg: Dhcp6Dxe: Packet-Length is not updated before appending

In order for Dhcp6AppendIaAddrOption (..) to safely append the IA
Address option, the Packet-Length field must be updated before appending
the option.

Cc: Saloni Kasbekar <saloni.kasbekar@intel.com>
Cc: Zachary Clark-williams <zachary.clark-williams@intel.com>
Signed-off-by: Doug Flick [MSFT] <doug.edk2@gmail.com>
Reviewed-by: Saloni Kasbekar <saloni.kasbekar@intel.com>
Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>
---
 NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c b/NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c
index e4e0725622..f38e3ee3fe 100644
--- a/NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c
+++ b/NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c
@@ -924,6 +924,11 @@ Dhcp6AppendIaOption (
     *PacketCursor += sizeof (T2);
   }
 
+  //
+  // Update the packet length
+  //
+  Packet->Length += BytesNeeded;
+
   //
   // Fill all the addresses belong to the Ia
   //
@@ -935,11 +940,6 @@ Dhcp6AppendIaOption (
     }
   }
 
-  //
-  // Update the packet length
-  //
-  Packet->Length += BytesNeeded;
-
   //
   // Fill the value of Ia option length
   //
-- 
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