mqtt: return error on truncated Remaining Length#21949
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Pointed out by: Zeropath
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Pull request overview
Tightens MQTT packet parsing by rejecting truncated variable-length “Remaining Length” fields, preventing invalid/incomplete length encodings from being accepted and mis-parsed in lib/mqtt.c.
Changes:
- Change
mqtt_decode_len()to returnbool(TRUE on error, FALSE on success) to match its existing call pattern. - Detect and reject truncated Remaining Length encodings (continuation bit still set when buffer ends).
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Pointed out by: Zeropath