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macOS/iOS: Fix rare crash when downloading tiles that returned a 404 #15313
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We were capturing the reference to an object that could go away when the request was canceled. However, the lambda could still be invoked by NSURLSession, creating a race condition with a resulting crash when the response to a tile request was 404 Not Found.
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I was unable to come up with a test case that can reliable reproduce this, given that it's a race condition bug, and we can't influence the exact ordering in which |
julianrex
approved these changes
Aug 5, 2019
friedbunny
added
needs changelog
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We were capturing the reference to an object that could go away when the request was canceled. However, the lambda could still be invoked by NSURLSession, creating a race condition with a resulting crash when the response to a tile request was 404 Not Found.
This fixes #14325 and #9814