191762 2018-11-16 11:48:41 -0800 EXC_BAD_ACCESS when invoking a DownloadProxy's destination decision handler after the download has been canceled 2018-11-26 09:22:24 -0800 1 1 1 Unclassified WebKit WebKit2 WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 david_quesada webkit-unassigned achristensen ap beidson commit-queue dino webkit-bug-importer oldest_to_newest 1479533 0 355089 david_quesada 2018-11-16 11:48:41 -0800 Created attachment 355089 Test case If a DownloadProxy is invalidated while the DownloadClient is deciding the destination, then the app will crash when the decision handler is called. The troublesome line of code is in DownloadProxy::decideDestinationWithSuggestedFilenameAsync: if (auto* networkProcess = m_processPool->networkProcess()) m_processPool is null (due to the DownloadProxyMap invalidating the proxy when the download is canceled), so you get an invalid memory access trying to get the process pool's m_networkProcess. So if you get unlucky and the UI process gets notified that the download has been canceled while the destination decision handler is still outstanding, you have three terrible options: - Call the decision handler and crash. - Don't call the decision handler, and crash due to CompletionHandlerCallChecker getting upset. - Strategically deallocate the handler block and @try/@catch the resulting exception to stay alive. The code in decideDestinationWithSuggestedFilenameAsync()'s handler should check that m_processPool in non-null before trying to access its network process. 1479941 1 webkit-bug-importer 2018-11-17 12:22:36 -0800 <rdar://problem/46151509> 1480164 2 355258 david_quesada 2018-11-19 00:48:25 -0800 Created attachment 355258 Patch 1480303 3 355258 commit-queue 2018-11-19 14:52:49 -0800 Comment on attachment 355258 Patch Clearing flags on attachment: 355258 Committed r238381: <https://trac.webkit.org/changeset/238381> 1480304 4 commit-queue 2018-11-19 14:52:50 -0800 All reviewed patches have been landed. Closing bug. 1481541 5 355258 achristensen 2018-11-26 09:22:24 -0800 Comment on attachment 355258 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=355258&action=review > Tools/TestWebKitAPI/Tests/WebKitCocoa/Download.mm:30 > +#if PLATFORM(MAC) || PLATFORM(IOS) Let's just remove this. 355089 2018-11-16 11:48:41 -0800 2018-11-16 11:48:41 -0800 Test case DownloadCrashExample.m text/x-objcsrc 1321 david_quesada I2ltcG9ydCAiVmlld0NvbnRyb2xsZXIuaCIKCiNpbXBvcnQgPFdlYktpdC9XZWJLaXQuaD4KI2lt cG9ydCA8V2ViS2l0L1dLTmF2aWdhdGlvbkRlbGVnYXRlUHJpdmF0ZS5oPgojaW1wb3J0IDxXZWJL aXQvV0tQcm9jZXNzUG9vbFByaXZhdGUuaD4KI2ltcG9ydCA8V2ViS2l0L19XS0Rvd25sb2FkLmg+ CiNpbXBvcnQgPFdlYktpdC9fV0tEb3dubG9hZERlbGVnYXRlLmg+CgpAaW50ZXJmYWNlIFZpZXdD b250cm9sbGVyICgpIDxXS05hdmlnYXRpb25EZWxlZ2F0ZSwgX1dLRG93bmxvYWREZWxlZ2F0ZT4K CkBlbmQKCkBpbXBsZW1lbnRhdGlvbiBWaWV3Q29udHJvbGxlciB7CiAgICBXS1dlYlZpZXcgKl93 ZWJWaWV3Owp9CgotICh2b2lkKXZpZXdEaWRMb2FkCnsKICAgIFtzdXBlciB2aWV3RGlkTG9hZF07 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