[libdispatch] libdispatch data fixes #3648
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…DispatchData.empty
* DispatchDataIterator is unsafe when iterating the empty
DispatchData object as it forcibly unwraps a nil pointer.
…safe
* The buffer-pointer based init methods were passing the dispatch
data default destructor in such a way that the
@convention(block)-ness was lost. This leads to a thunk being passed
to dispatch instead of NULL. Subsequently, dispatch would reference
rather than copy the provided data.
Fixes:
SR-2050 (<rdar://problem/27293973>)
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@swift-ci please test |
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@DougGregor Another for review. |
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LGTM, thanks! |
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What's in this pull request?
Two fixes:
DispatchDataIteratorcrashed when iterating the empty dispatch data object.UnsafeBufferPointervalues to aDispatchDatacauses libdispatch to be invoked with the wrong destructor pointer, leading to corruption of the data objects.Resolved bug number:
(SR-2050)
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