[lwip-devel] [bug #49914] lwip_sendmsg uses PBUF_REF pbufs

[Dirk Ziegelmeier]

URL:
  <http://savannah.nongnu.org/bugs/?49914>

                 Summary: lwip_sendmsg uses PBUF_REF pbufs
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: dziegel
            Submitted on: Thu 22 Dec 2016 08:13:42 PM GMT
                Category: sockets/netconn
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.0.0

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Details:

... and thus does not create a copy of the data to be sent in RAW/UDP case.
This may have problems with DMA netifs, where the output function may return
before the data was sent out. The caller may free/reuse the buffer before data
was actually sent.




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