prevent overflow on MaxRetries

pkg/solana/config/config.go

@@ -20,7 +20,7 @@ var defaultConfigSet = configSet{
 	TxConfirmTimeout:    30 * time.Second,       // duration before discarding tx as unconfirmed
 	SkipPreflight:       true,                   // to enable or disable preflight checks
 	Commitment:          rpc.CommitmentConfirmed,
-	MaxRetries:          new(uint), // max number of retries, when nil - rpc node will do a reasonable number of retries
+	MaxRetries:          new(uint), // max number of retries (default = *new(uint) = 0). when config.MaxRetries < 0, interpreted as MaxRetries = nil and rpc node will do a reasonable number of retries
 
 	// fee estimator
 	FeeEstimatorMode:        "fixed",

pkg/solana/config/toml.go

@@ -170,6 +170,9 @@ func (c *TOMLConfig) MaxRetries() *uint {
 	if c.Chain.MaxRetries == nil {
 		return nil
 	}
+	if *c.Chain.MaxRetries < 0 {
+		return nil // interpret negative numbers as nil (prevents unlikely case of overflow)
+	}
 	mr := uint(*c.Chain.MaxRetries)
 	return &mr
 }