X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fonion_message%2Fpacket.rs;h=d4ba28c843b9dde23be1e41111bda0797e44128a;hb=81b7b03d4ff7424e61b073b81cf4edf627c8694b;hp=a3414d844edff9cb96f5d6b15cf36e5807b29d9a;hpb=28c9b56113ff1ebb1b505a2c979c55c1626aa06b;p=rust-lightning

diff --git a/lightning/src/onion_message/packet.rs b/lightning/src/onion_message/packet.rs
index a3414d84..d4ba28c8 100644
--- a/lightning/src/onion_message/packet.rs
+++ b/lightning/src/onion_message/packet.rs
@@ -69,7 +69,7 @@ impl LengthReadable for Packet {
 		let public_key = Readable::read(r)?;
 
 		let mut hop_data = Vec::new();
-		let hop_data_len = r.total_bytes() as usize - 66; // 1 (version) + 33 (pubkey) + 32 (HMAC) = 66
+		let hop_data_len = r.total_bytes().saturating_sub(66) as usize; // 1 (version) + 33 (pubkey) + 32 (HMAC) = 66
 		let mut read_idx = 0;
 		while read_idx < hop_data_len {
 			let mut read_buffer = [0; READ_BUFFER_SIZE];