Fix: don't overflow on target adjustment (#76)

* don't panic on overflow * update wasm * change u64 cast
Near-One · Nov 26, 2024 · 1ee8047 · 1ee8047
1 parent 6bb84f8
commit 1ee8047
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Showing 3 changed files with 2 additions and 1 deletion.
diff --git a/contract/src/lib.rs b/contract/src/lib.rs
@@ -482,8 +482,9 @@ impl BtcLightClient {
             .headers_pool
             .get(&interval_tail_header_hash)
             .unwrap_or_else(|| env::panic_str(ERR_KEY_NOT_EXIST));
+        let prev_block_time = prev_block_header.block_header.time;
         let mut actual_time_taken = u64::from(
-            prev_block_header.block_header.time - interval_tail_extend_header.block_header.time,
+            prev_block_time.saturating_sub(interval_tail_extend_header.block_header.time),
         );
 
         if actual_time_taken < EXPECTED_TIME / MAX_ADJUSTMENT_FACTOR {

diff --git a/res/btc_light_client_mainnet.wasm b/res/btc_light_client_mainnet.wasm
diff --git a/res/btc_light_client_testnet.wasm b/res/btc_light_client_testnet.wasm