From e0201eb4e007e7524aef007be67f2281f949f102 Mon Sep 17 00:00:00 2001
From: Nick Banks <nibanks@microsoft.com>
Date: Wed, 25 Sep 2024 14:16:29 -0400
Subject: [PATCH] Zero out memory from PacketNumber in
 QuicBindingPreprocessPacket (#4560)

---
 src/core/binding.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/core/binding.c b/src/core/binding.c
index 68d538f8fd..b0296a0ca5 100644
--- a/src/core/binding.c
+++ b/src/core/binding.c
@@ -1134,7 +1134,9 @@ QuicBindingPreprocessPacket(
     _Out_ BOOLEAN* ReleaseDatagram
     )
 {
-    CxPlatZeroMemory(&Packet->PacketNumber, sizeof(QUIC_RX_PACKET) - sizeof(uint64_t));
+    CxPlatZeroMemory(   // Zero out everything from PacketNumber forward
+        &Packet->PacketNumber,
+        sizeof(QUIC_RX_PACKET) - offsetof(QUIC_RX_PACKET, PacketNumber));
     Packet->AvailBuffer = Packet->Buffer;
     Packet->AvailBufferLength = Packet->BufferLength;