Check if signature actually fits in file

2017-07-13 21:59:39 +02:00
parent 3928b7d813
commit e51daf9a81
1 changed files with 4 additions and 0 deletions
--- a/sign/pdfsignature.go
+++ b/sign/pdfsignature.go
@@ -241,6 +241,10 @@ func (context *SignContext) replaceSignature() error {
 	dst := make([]byte, hex.EncodedLen(len(signature)))
 	hex.Encode(dst, signature)

+	if uint32(len(dst)) > signatureMaxLength {
+		return errors.New("Signature is too big to fit in reserved space.")
+	}
+
 	context.OutputFile.WriteAt(dst, context.ByteRangeValues[0]+context.ByteRangeValues[1]+1)

 	return nil