fetch the light block at trusted_height+1 when detecting misbehaviour

informalsystems · Nov 16, 2023 · 38f65a6 · 38f65a6
1 parent 9e1b91b
commit 38f65a6
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/crates/relayer/src/light_client/tendermint.rs b/crates/relayer/src/light_client/tendermint.rs
@@ -173,7 +173,8 @@ impl super::LightClient<CosmosSdkChain> for LightClient {
             provider: self.peer_id,
         };
 
-        let trusted_block = self.fetch(update_header.trusted_height)?;
+        // Get the light block at trusted_height + 1 from chain.
+        let trusted_block = self.fetch(update_header.trusted_height.increment())?;
         if trusted_block.validators.hash() != update_header.trusted_validator_set.hash() {
             return Err(Error::misbehaviour(format!(
                 "mismatch between the trusted validator set of the update \