fix overflow

libi2pd/Streaming.cpp

@@ -242,8 +242,10 @@ namespace stream
 
 		if (flags & PACKET_FLAG_SIGNATURE_INCLUDED)
 		{
-			uint8_t signature[256];
+			uint8_t signature[512];
 			auto signatureLen = m_RemoteIdentity->GetSignatureLen ();
+			if(signatureLen <= sizeof(signature))
+			{
 				memcpy (signature, optionData, signatureLen);
 				memset (const_cast<uint8_t *>(optionData), 0, signatureLen);
 				if (!m_RemoteIdentity->Verify (packet->GetBuffer (), packet->GetLength (), signature))
@@ -255,6 +257,11 @@ namespace stream
 				memcpy (const_cast<uint8_t *>(optionData), signature, signatureLen);
 				optionData += signatureLen;
 			}
+			else
+			{
+				LogPrint(eLogError, "Streaming: Signature too big, ", signatureLen, " bytes");
+			}
+		}
 
 		packet->offset = packet->GetPayload () - packet->buf;
 		if (packet->GetLength () > 0)