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| author | Martin Holst Swende <martin@swende.se> | 2018-12-20 17:46:08 +0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-12-20 17:46:08 +0800 |
| commit | 5f251a6448b3385015ab531c35071743f93cafae (patch) | |
| tree | f3cb4025c93f26d43f8cf93d40539b92da6acba4 | |
| parent | fe86a707d8270108e0fb77359e702689664dcb4b (diff) | |
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downloader: fix edgecase where returned index is OOB for downloader (#18335)
* downloader: fix edgecase where returned index is OOB for downloader
* downloader: documentation
Co-Authored-By: holiman <martin@swende.se>
| -rw-r--r-- | eth/downloader/downloader.go | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go index 3a177ab9d..4db689f73 100644 --- a/eth/downloader/downloader.go +++ b/eth/downloader/downloader.go @@ -1488,7 +1488,15 @@ func (d *Downloader) importBlockResults(results []*fetchResult) error { blocks[i] = types.NewBlockWithHeader(result.Header).WithBody(result.Transactions, result.Uncles) } if index, err := d.blockchain.InsertChain(blocks); err != nil { - log.Debug("Downloaded item processing failed", "number", results[index].Header.Number, "hash", results[index].Header.Hash(), "err", err) + if index < len(results) { + log.Debug("Downloaded item processing failed", "number", results[index].Header.Number, "hash", results[index].Header.Hash(), "err", err) + } else { + // The InsertChain method in blockchain.go will sometimes return an out-of-bounds index, + // when it needs to preprocess blocks to import a sidechain. + // The importer will put together a new list of blocks to import, which is a superset + // of the blocks delivered from the downloader, and the indexing will be off. + log.Debug("Downloaded item processing failed on sidechain import", "index", index, "err", err) + } return errInvalidChain } return nil |