check block store base is non negative before sending block meta or commits (#6042)

consensus/reactor.go

@@ -520,7 +520,8 @@ OUTER_LOOP:
 		}
 
 		// If the peer is on a previous height that we have, help catch up.
-		if (0 < prs.Height) && (prs.Height < rs.Height) && (prs.Height >= conR.conS.blockStore.Base()) {
+		blockStoreBase := conR.conS.blockStore.Base()
+		if blockStoreBase > 0 && 0 < prs.Height && prs.Height < rs.Height && prs.Height >= blockStoreBase {
 			heightLogger := logger.With("height", prs.Height)
 
 			// if we never received the commit message from the peer, the block parts wont be initialized
@@ -528,7 +529,7 @@ OUTER_LOOP:
 				blockMeta := conR.conS.blockStore.LoadBlockMeta(prs.Height)
 				if blockMeta == nil {
 					heightLogger.Error("Failed to load block meta",
-						"blockstoreBase", conR.conS.blockStore.Base(), "blockstoreHeight", conR.conS.blockStore.Height())
+						"blockstoreBase", blockStoreBase, "blockstoreHeight", conR.conS.blockStore.Height())
 					time.Sleep(conR.conS.config.PeerGossipSleepDuration)
 				} else {
 					ps.InitProposalBlockParts(blockMeta.BlockID.PartSetHeader)
@@ -674,7 +675,8 @@ OUTER_LOOP:
 
 		// Catchup logic
 		// If peer is lagging by more than 1, send Commit.
-		if prs.Height != 0 && rs.Height >= prs.Height+2 && prs.Height >= conR.conS.blockStore.Base() {
+		blockStoreBase := conR.conS.blockStore.Base()
+		if blockStoreBase > 0 && prs.Height != 0 && rs.Height >= prs.Height+2 && prs.Height >= blockStoreBase {
 			// Load the block commit for prs.Height,
 			// which contains precommit signatures for prs.Height.
 			if commit := conR.conS.blockStore.LoadBlockCommit(prs.Height); commit != nil {