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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 38148] New: - One Failed Request Can Possibly Overwrite Another Active Request's PUT
Date Thu, 05 Jan 2006 23:25:03 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=38148

           Summary: One Failed Request Can Possibly Overwrite Another Active
                    Request's PUT
           Product: Apache httpd-2
           Version: 2.0.55
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_dav
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: lardcanoe@gmail.com


If a client PUTs a file, and its Timeout is shorter than the server's Timeout,
and the client then PUTs the file again, the first request will fail and the
call to close_stream will delete the file even though the second PUT is
currently writing to it. So the second PUT thinks the file is all there even
though it isn't.

I'm not sure if this is a bug per se, but it is something that I encountered and
fixed myself, and I feel it could go into the mod_dav.c code.

Also, I strongly recommend adding code that explicitly checks to see if the file
really does exist at the end of the PUT and also checks the filesize to see if
it matches the number of bytes written. A simple call to "stat" would be sufficient.

We experience hundreds of thousands of PUTs a night, and a few files generally
just disappear without any errors in the error_log.

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