[5.8][Runtime] Fix swift_weakTakeStrong(). #65857
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It turns out that when taking the last weak reference for an object that has been deallocated, we might have returned a non-null pointer when we shouldn't have. Which is exciting. rdar://106375185
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Explanation: Fixes a potential source of UAF bugs. |
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@swift-ci Please test |
al45tair
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🍒 release cherry pick
al45tair
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airspeedswift
approved these changes
May 11, 2023
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It turns out that when taking the last weak reference for an object that has been deallocated, we might have returned a non-null pointer when we shouldn't have. Which is exciting.
rdar://106375185, rdar://109151498