use DecodeLimit when decoding incoming calls (#1344)

Author: svyatonik

bridges/bin/runtime-common/Cargo.toml

@@ -29,6 +29,7 @@ frame-support = { git = "https://github.com/paritytech/substrate", branch = "mas
 frame-system = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 pallet-balances = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 pallet-transaction-payment = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
+sp-api = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-core = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-runtime = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-state-machine = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
@@ -50,6 +51,7 @@ std = [
 	"pallet-bridge-messages/std",
 	"pallet-transaction-payment/std",
 	"scale-info/std",
+	"sp-api/std",
 	"sp-core/std",
 	"sp-runtime/std",
 	"sp-state-machine/std",

bridges/bin/runtime-common/src/messages.rs

@@ -30,7 +30,7 @@ use bp_runtime::{
 	messages::{DispatchFeePayment, MessageDispatchResult},
 	ChainId, Size, StorageProofChecker,
 };
-use codec::{Decode, Encode};
+use codec::{Decode, DecodeLimit, Encode};
 use frame_support::{
 	traits::{Currency, ExistenceRequirement},
 	weights::{Weight, WeightToFeePolynomial},
@@ -521,7 +521,11 @@ pub mod target {
 		for Result<DecodedCall, ()>
 	{
 		fn from(encoded_call: FromBridgedChainEncodedMessageCall<DecodedCall>) -> Self {
-			DecodedCall::decode(&mut &encoded_call.encoded_call[..]).map_err(drop)
+			DecodedCall::decode_with_depth_limit(
+				sp_api::MAX_EXTRINSIC_DEPTH,
+				&mut &encoded_call.encoded_call[..],
+			)
+			.map_err(drop)
 		}
 	}