[Runtime] In various enumTagSinglePayload functions, don't read getEx traInhabitantIndex or storeExtraInhabitant unless it actually has extra inhabitants. #17879
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…traInhabitantIndex or storeExtraInhabitant unless it actually has extra inhabitants. This code would previously read off the end of the allocated metadata to fetch these values. This was usually harmless, as the value was never used in that case. However, on rare occasions the metadata would be right before unmapped memory, and this read would crash trying to access that unmapped memory. rdar://problem/39866044
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@swift-ci please test linux |
This was referenced Jul 11, 2018
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This code would previously read off the end of the allocated metadata to fetch these values. This was usually harmless, as the value was never used in that case. However, on rare occasions the metadata would be right before unmapped memory, and this read would crash trying to access that unmapped memory.
rdar://problem/39866044