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Ensure that stack layers above transport manager never get chained packet buffers. #9599

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Commits on Sep 10, 2021

  1. Ensure that stack layers above transport manager never get chained pa…

    …cket buffers.
    
    None of our upper-layer core really deals with chained packet buffers,
    starting with the way we do in-place decryption that assumes that we
    have a contiguous buffer.
    
    The changes here:
    
    1) Flatten out possibly-chained buffers in the LwIP case in the UDP
       endpoint.
    2) Ensure that we don't have a chained buffer in BTP.  There was
       already a check for this in the "in progress" case; this change just
       adds the same check in the "idle" case.
    bzbarsky-apple committed Sep 10, 2021
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