[lwip-devel] [patch #8877] sio: avoid implicit type cast in sio_read/sio_write

[Stephan Linz]

URL:
  <http://savannah.nongnu.org/patch/?8877>

                 Summary: sio: avoid implicit type cast in sio_read/sio_write
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: slz
            Submitted on: Do 21 Jan 2016 20:10:50 CET
                Category: Contrib
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

On POSIX systems the result of read() and write() can be negative to mark an
error. The current implementation of sio_read() and sio_write() will have an
implicit type cast from signed integer to unsigned integer.

Every time, when a error has happened, the upper layer sees a much too large
number of received or sendet bytes. That leads to a potential buffer overrun
or misinterpretation of what has happened.



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File Attachments:


-------------------------------------------------------
Date: Do 21 Jan 2016 20:10:50 CET  Name:
0004-sio-avoid-implicit-type-cast-in-sio_read-sio_write.patch  Size: 1kB   By:
slz

<http://savannah.nongnu.org/patch/download.php?file_id=36118>

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