BOLT2: Check we don't send and accept 0-msat HTLC

[rust-lightning] / lightning / src / ln / channel.rs

diff --git a/lightning/src/ln/channel.rs b/lightning/src/ln/channel.rs
index 8b5d9120babb2e98eccdcccb3e472443e5b070d8..5771f772eac1751475e234f57c89557cd8568424 100644 (file)
--- a/lightning/src/ln/channel.rs
+++ b/lightning/src/ln/channel.rs
@@ -1656,6 +1656,9 @@ impl<ChanSigner: ChannelKeys> Channel<ChanSigner> {
                if msg.amount_msat > self.channel_value_satoshis * 1000 {
                        return Err(ChannelError::Close("Remote side tried to send more than the total value of the channel"));
                }
+               if msg.amount_msat == 0 {
+                       return Err(ChannelError::Close("Remote side tried to send a 0-msat HTLC"));
+               }
                if msg.amount_msat < self.our_htlc_minimum_msat {
                        return Err(ChannelError::Close("Remote side tried to send less than our minimum HTLC value"));
                }
@@ -3493,6 +3496,11 @@ impl<ChanSigner: ChannelKeys> Channel<ChanSigner> {
                if amount_msat > self.channel_value_satoshis * 1000 {
                        return Err(ChannelError::Ignore("Cannot send more than the total value of the channel"));
                }
+
+               if amount_msat == 0 {
+                       return Err(ChannelError::Ignore("Cannot send 0-msat HTLC"));
+               }
+
                if amount_msat < self.their_htlc_minimum_msat {
                        return Err(ChannelError::Ignore("Cannot send less than their minimum HTLC value"));
                }