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ResizableArray.ensureSize has an infinite loop when the new size is larger than Int.MaxValue/2 #7880

scabug opened this issue Sep 26, 2013 · 2 comments


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@scabug scabug commented Sep 26, 2013

In ensureSize below, when n > Int.MaxValue then newsize: Int may overflow (newsize = newsize * 2) and become negative. Once negative the while loop will never terminate.

How to reproduce: fill an ArrayBuffer with about 2GB of Bytes.

protected def ensureSize(n: Int) {
if (n > array.length) {
var newsize = array.length * 2
while (n > newsize)
newsize = newsize * 2

  val newar: Array[AnyRef] = new Array(newsize)
  scala.compat.Platform.arraycopy(array, 0, newar, 0, size0)
  array = newar


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@scabug scabug commented Sep 26, 2013

Imported From:
Reporter: Feico Dillema (fwd)
Affected Versions: 2.10.1, 2.10.2

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@scabug scabug commented Dec 17, 2013

@soc said:
PR: scala/scala#3284

Feico, could you have a look and confirm that this fixes your issue? Thanks!

@scabug scabug closed this Jan 3, 2014
@scabug scabug added the library label Apr 7, 2017
@scabug scabug added this to the 2.11.0-M8 milestone Apr 7, 2017
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