From 1a45c11dfb7a07764ed8a7745b93cbbdc263a8c4 Mon Sep 17 00:00:00 2001
From: Simon Maddocks <git@51m0n.com>
Date: Wed, 2 Feb 2022 23:12:08 +0000
Subject: [PATCH] Add check for packets missing a nonce

---
 Romulus-M/encrypt_wrapper.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Romulus-M/encrypt_wrapper.c b/Romulus-M/encrypt_wrapper.c
index 0737e4a..ffff5f3 100644
--- a/Romulus-M/encrypt_wrapper.c
+++ b/Romulus-M/encrypt_wrapper.c
@@ -125,6 +125,11 @@ int decrypt(packetEx *packet, unsigned char *inBuf, UINT16 len, unsigned char *k
     // n = nonce, CRYPTO_NPUBBYTES size 16
     unsigned char *npub = &inBuf[loc];
     loc += CRYPTO_NPUBBYTES;
+    
+    if ((len - loc) < 0 )
+    {
+        return 1;
+    }
 
     // ciphertext - in, MAX 16 bytes larger than plaintext - defined as CRYPTO_ABYTES
     int clen = len - loc;