RFR: JDK-8013827 and JDK-8011950, , java.io.File.createTempFile enters infinite loop when passed invalid data (original) (raw)

Alan Bateman Alan.Bateman at oracle.com
Wed May 29 11:54:06 UTC 2013

On 28/05/2013 19:39, Dan Xu wrote:

Hi All,

When File.createTempFile() is called with some special parameters, it runs into infiniteloop and hangs. It is because it does not always mean a file exists when the method, createFileExclusively(), returns false. This fix is going to solve such issues reported in JDK-8013827 and JDK-8011950.And I also added some testcases to verify it. webrev: http://cr.openjdk.java.net/~dxu/8013827/webrev.00/ bug: http://bugs.sun.com/viewbug.do?bugid=8011950 -Dan Thanks for taking this one.

The changes mean that IAE is now thrown for cases where it wasn't thrown previously and I'm wondering if this is worth doing. It might be simpler to just throw IOException on the grounds that creating the file will fail.

One other thing to consider is that "" is a valid name of a file on some platforms. I suspect you'll need to delegate to the FileSystem to check the suffix/prefix. Alternatively in TempDirectory.generateFile you could create a File from prefix/n/suffix and call getName to check that its matches. If not then throw an exception.

-Alan.

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