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

Dan Xu dan.xu at oracle.com
Fri May 31 18:15:51 UTC 2013

On 05/29/2013 04:54 AM, Alan Bateman wrote:
> 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/view_bug.do?bug_id=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.
Thanks for your good review. I have updated my changes. And it is 
uploaded at, http://cr.openjdk.java.net/~dxu/8013827/webrev.01/.


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