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Fix the algorithm for decoding the remaining length to allow a length greater than 2,097,151 bytes.

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See: https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/errata01/os/mqtt-v3.1.1-errata01-os.html#_Toc442180732
This commit is contained in:
kpreisser
2018-01-24 15:32:36 +01:00
parent 8b2b8d41df
commit 88de5047bc
1 changed files with 2 additions and 2 deletions
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Frameworks/MQTTnet.NetStandard/Serializer/MqttPacketReader.cs
+2 -2
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@@ -86,7 +86,7 @@ namespace MQTTnet.Serializer
private static async Task<int> ReadBodyLengthFromSourceAsync(Stream stream, CancellationToken cancellationToken)
{
// Alorithm taken from http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html.
// Alorithm taken from https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/errata01/os/mqtt-v3.1.1-errata01-os-complete.html.
var multiplier = 1;
var value = 0;
byte encodedByte;
@@ -110,11 +110,11 @@ namespace MQTTnet.Serializer
readBytes.Add(encodedByte);
value += (byte)(encodedByte & 127) * multiplier;
multiplier *= 128;
if (multiplier > 128 * 128 * 128)
{
throw new MqttProtocolViolationException($"Remaining length is invalid (Data={string.Join(",", readBytes)}).");
}
multiplier *= 128;
} while ((encodedByte & 128) != 0);
return value;