[lwip-devel] [bug #44032] select might work on invalid/reused socket

[Simon Goldschmidt]

URL:
  <http://savannah.nongnu.org/bugs/?44032>

                 Summary: select might work on invalid/reused socket
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: goldsimon
            Submitted on: Sa 17 Jan 2015 20:18:08 GMT
                Category: sockets/netconn
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: git head

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Details:

When a socket gets closed and reused from another thread while select is
waiting on it, 'select_waiting--' can be executed on this socket although it's
not the socket where 'select_waiting++' was executed before (this mainly
depends on the priorities of the threads using sockets).

To circumvent this, we could either not completely free sockets where select
is waiting or add a global 'sockalloc' counter, stored per socket, which
select could used to detect newly allocated sockets.




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