Rob Percival created PROTON-336:

             Summary: pn_messenger_put does not clear PN_OVERFLOW error after 
expanding its buffer
                 Key: PROTON-336
             Project: Qpid Proton
          Issue Type: Bug
          Components: proton-c
    Affects Versions: 0.3
            Reporter: Rob Percival

In pn_messenger_put, the buffer is initialised to an array of 1024 bytes. It 
then tries to encode the message and if it won't fit, a PN_OVERFLOW error 
occurs (against the message). The buffer is then doubled in size and it retries 
encoding. However, the PN_OVERFLOW error is not cleared. This means that after 
pn_messenger_put returns successfully, calling pn_message_errno will report 
that a PN_OVERFLOW error occurred. The error message, unhelpfully, is "data 
error: (null)".

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