142776 2015-03-17 01:05:27 -0700 Reproducible null deref under ScriptedAnimationController::createDisplayRefreshMonitor 2015-03-17 12:17:03 -0700 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 thorton thorton andersca ap simon.fraser oldest_to_newest 1077809 0 thorton 2015-03-17 01:05:27 -0700 Reproducible null deref under ScriptedAnimationController::createDisplayRefreshMonitor 1077811 1 248829 thorton 2015-03-17 01:10:25 -0700 Created attachment 248829 Patch 1077812 2 thorton 2015-03-17 01:11:00 -0700 <rdar://problem/18921338> 1077877 3 248829 ap 2015-03-17 06:40:09 -0700 Comment on attachment 248829 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=248829&action=review This looks like a lot of complexity to do the not quite right thing. Or did you determine that it's right to ignore the call? > LayoutTests/fast/animation/request-animation-frame-unparented-iframe-crash.html:7 > +setTimeout(function () { This races with parsing, as the timeout can fire before iframe is parsed, and certainly before it loads. I'd do this in onload. 1077881 4 248829 darin 2015-03-17 08:10:00 -0700 Comment on attachment 248829 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=248829&action=review > Source/WebCore/dom/ScriptedAnimationController.cpp:232 > + if (!m_document->page()) > + return Optional<RefPtr<DisplayRefreshMonitor>>(nullptr); This seems really subtle. The difference in semantic between an optional containing a nullptr and one containing Nullopt is not at all clear, so if we are going to use this idiom we’ll need a comment somewhere. > Source/WebCore/platform/graphics/DisplayRefreshMonitor.cpp:44 > - if (RefPtr<DisplayRefreshMonitor> monitor = client->createDisplayRefreshMonitor(displayID)) > - return monitor.release(); > + Optional<RefPtr<DisplayRefreshMonitor>> monitor = client->createDisplayRefreshMonitor(displayID); > + if (monitor) > + return monitor.value(); Why move the definition outside the if statement? Seems like it was better before. > Source/WebCore/platform/graphics/DisplayRefreshMonitorManager.cpp:97 > DisplayRefreshMonitor* monitor = ensureMonitorForClient(client); A function named “ensure” that can return null is not a normal pattern in WebKit code. We should fix that. 1077916 5 thorton 2015-03-17 11:26:13 -0700 (In reply to comment #3) > Comment on attachment 248829 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=248829&action=review > > This looks like a lot of complexity to do the not quite right thing. Or did > you determine that it's right to ignore the call? The other browsers agree (dropping the callback on the floor), so I'm going to go with it. I'm much more concerned about creating the wrong kind of DisplayRefreshMonitor and then sticking it in the map and using it from somewhere else - that is very scary. > > LayoutTests/fast/animation/request-animation-frame-unparented-iframe-crash.html:7 > > +setTimeout(function () { > > This races with parsing, as the timeout can fire before iframe is parsed, > and certainly before it loads. > > I'd do this in onload. Of course! That was silly of me. Thanks! (In reply to comment #4) > Comment on attachment 248829 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=248829&action=review > > > Source/WebCore/dom/ScriptedAnimationController.cpp:232 > > + if (!m_document->page()) > > + return Optional<RefPtr<DisplayRefreshMonitor>>(nullptr); > > This seems really subtle. The difference in semantic between an optional > containing a nullptr and one containing Nullopt is not at all clear, so if > we are going to use this idiom we’ll need a comment somewhere. It is subtle. I'll leave a better comment. I tried an alternative patch where ChromeClient *always* returns a value (never "I dunno, make the default") if it's available, moving the platform #ifs into ChromeClient. For some reason that exploded to be much messier than you'd expect (mostly I guess because currently the platform DisplayRefreshMonitor implementations are internal to WebCore). > > Source/WebCore/platform/graphics/DisplayRefreshMonitor.cpp:44 > > - if (RefPtr<DisplayRefreshMonitor> monitor = client->createDisplayRefreshMonitor(displayID)) > > - return monitor.release(); > > + Optional<RefPtr<DisplayRefreshMonitor>> monitor = client->createDisplayRefreshMonitor(displayID); > > + if (monitor) > > + return monitor.value(); > > Why move the definition outside the if statement? Seems like it was better > before. Indeed, that was a mistake. > > Source/WebCore/platform/graphics/DisplayRefreshMonitorManager.cpp:97 > > DisplayRefreshMonitor* monitor = ensureMonitorForClient(client); > > A function named “ensure” that can return null is not a normal pattern in > WebKit code. We should fix that. tryEnsureMonitorForClient? createMonitorForClient? (creates can fail) 1077928 6 thorton 2015-03-17 12:17:03 -0700 http://trac.webkit.org/changeset/181656 248829 2015-03-17 01:10:25 -0700 2015-03-17 06:40:09 -0700 Patch bug-142776-20150317010955.patch text/plain 19130 thorton U3VidmVyc2lvbiBSZXZpc2lvbjogMTgxNTY5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggOGI0YWM5YWRmYTNkMDU5 YzY1MDFkYTVkNTRhYzM5NWViZWU1MThhNi4uMTYwZjcxN2MxMmI1NjY2NzY0ZjAxYmRmNDI4MDc1 ZDc0YTAxOTAzYiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDYyIEBACisyMDE1LTAzLTE3ICBUaW1v dGh5IEhvcnRvbiAgPHRpbW90aHlfaG9ydG9uQGFwcGxlLmNvbT4KKworICAgICAgICBSZXByb2R1 Y2libGUgbnVsbCBkZXJlZiB1bmRlciBTY3JpcHRlZEFuaW1hdGlvbkNvbnRyb2xsZXI6OmNyZWF0 ZURpc3BsYXlSZWZyZXNoTW9uaXRvcgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9z aG93X2J1Zy5jZ2k/aWQ9MTQyNzc2CisgICAgICAgIDxyZGFyOi8vcHJvYmxlbS8xODkyMTMzOD4K KworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBUZXN0OiBm 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