Fetch the light block at trusted_height + 1 when detecting misbehavior (

#3727) * fetch the light block at trusted_height+1 when detecting misbehaviour * Add changelog entry * Fix typo --------- Co-authored-by: beer-1 <[email protected]>
informalsystems · Dec 13, 2023 · 7093e7a · 7093e7a
1 parent 045023a
commit 7093e7a
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diff --git a/.changelog/unreleased/bug-fixes/ibc-relayer-cli/3697-fix-evidence-report.md b/.changelog/unreleased/bug-fixes/ibc-relayer-cli/3697-fix-evidence-report.md
@@ -0,0 +1,4 @@
+- Fix a bug in the `evidence` command which would sometimes
+  prevent the detected misbehaviour evidence from being submitted,
+  instead erroring out with a validator set hash mismatch.
+  ([\#3697](https://github.com/informalsystems/hermes/pull/3697))
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 \