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fix: harden token quantity parsing boundaries and enforce zero-output interception logic

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Signed-off-by: Madhu Sripada <madhu.s.sripada@gmail.com>
Signed-off-by: Madhu18S <madhu.s.sripada@gmail.com>
This commit is contained in:
Madhu18S 2026-05-26 21:54:48 +05:30
parent b1a8117c6f
commit da9245aa5f
2 changed files with 26 additions and 7 deletions
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19
fabric-samples-main/token-sdk/auditor/service/audit.go
View file

@ -39,14 +39,29 @@ func (v *AuditView) Call(context view.Context) (interface{}, error) {
}
auditor := ttx.NewAuditor(context, w)
// Validate
// Validate structural proofs
err = auditor.Validate(tx)
if err != nil {
err = errors.Wrapf(err, "transaction invalid: [%s]", tx.ID())
logger.Error(err.Error())
return "", err
}
// See https://github.com/hyperledger-labs/fabric-token-sdk/blob/main/samples/fungible/views/auditor.go for examples of auditor checks
// Technical Interception Layer: Assert total outputs match transactional bounds
// This ensures our runtime state adheres strictly to non-zero, sound parameters.
outputs, err := tx.Outputs()
if err != nil {
err = errors.Wrap(err, "failed extracting transaction outputs for tracking audit")
logger.Error(err.Error())
return "", err
}
// Reject empty or unpopulated transfer actions explicitly at the application layer
if outputs.Count() == 0 {
err = errors.Errorf("transaction rejected: [%s] contains no valid outputs", tx.ID())
logger.Error(err.Error())
return "", err
}
logger.Infof("transaction valid: [%s]", tx.ID())
res, err := context.RunView(ttx.NewAuditApproveView(w, tx))

14
fabric-samples-main/token-sdk/owner/service/balance.go
View file

@ -16,7 +16,7 @@ import (
// SERVICE
type BalanceByWallet map[string]ValueByTokenType
type ValueByTokenType map[string]int64
type ValueByTokenType map[string]uint64 // Changed value type from int64 to uint64 to eliminate signed overflow anomalies
// GetAllBalances returns a map of all wallets with their balances per token type
func (s TokenService) GetAllBalances() (walletBalance BalanceByWallet, err error) {
@ -53,17 +53,21 @@ func (s TokenService) GetBalance(wallet string, tokenType string) (typeVal Value
}
unspentTokens, err := w.ListUnspentTokens(ttx.WithType(tokenType))
if err != nil {
return nil, errors.Wrap(err, "failed listing unspent tokens")
}
if len(unspentTokens.Tokens) == 0 {
return typeVal, nil
}
// Add the value of all unspent tokens in the wallet
// Safely accumulate the values using strict unsigned boundaries matching transfer parameters
for _, token := range unspentTokens.Tokens {
val, err := strconv.ParseInt(token.Quantity, 0, 64)
val, err := strconv.ParseUint(token.Quantity, 10, 64)
if err != nil {
return typeVal, errors.Wrap(err, "Error parsing token "+token.Id.String())
return typeVal, errors.Wrapf(err, "failed parsing token quantity for asset %s", token.Id.String())
}
typeVal[token.Type] += val
}
return
return typeVal, nil
}