159495 2016-07-06 15:53:52 -0700 Return values of JSArray::createUninitialized (and related) are not consistently checked for nullptr 2016-07-21 01:04:33 -0700 1 1 1 Unclassified WebKit WebCore Misc. WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=160014 InRadar P2 Normal --- 1 bfulgham bfulgham bfulgham cdumez commit-queue dino esprehn+autocc gyuyoung.kim kondapallykalyan mkwst zalan oldest_to_newest 1208425 0 bfulgham 2016-07-06 15:53:52 -0700 Various members of the JSArray class hierarchy provide some version of createUninitialized/tryCreateUninitialized. These implementations return nullptr when various bad conditions exist, such as requests greater than available memory, etc. While we have nullptr checks in most places, there are a number of cases where these are not present. This makes it possible for arbitrary web content to crash WebKit through a nullptr dereference. 1208447 1 282964 bfulgham 2016-07-06 16:57:29 -0700 Created attachment 282964 Patch 1208452 2 bfulgham 2016-07-06 16:59:20 -0700 <rdar://problem/26075433> 1208453 3 282964 ggaren 2016-07-06 17:00:12 -0700 Comment on attachment 282964 Patch Why are we logging these failures instead of throwing a JS exception? 1208455 4 282964 dino 2016-07-06 17:02:51 -0700 Comment on attachment 282964 Patch Why didn't we see a log in the test output? 1208459 5 bfulgham 2016-07-06 17:15:06 -0700 (In reply to comment #4) > Comment on attachment 282964 [details] > Patch > > Why didn't we see a log in the test output? It shows up in the stderr, so if the test fails you actually can see the logging output. I don't know how to get WTFLogAlways stuff into test output. 1208461 6 bfulgham 2016-07-06 17:29:43 -0700 (In reply to comment #3) > Comment on attachment 282964 [details] > Patch > > Why are we logging these failures instead of throwing a JS exception? I don't think we throw JS exceptions from deep inside platform code (or at least a quick search didn't find anything helpful). I definitely CAN do so in CanvasRenderingContext2D::getImageData, which makes the test much clearer. 1208465 7 282969 bfulgham 2016-07-06 17:39:20 -0700 Created attachment 282969 Patch 1208477 8 282969 commit-queue 2016-07-06 18:03:34 -0700 Comment on attachment 282969 Patch Clearing flags on attachment: 282969 Committed r202887: <http://trac.webkit.org/changeset/202887> 1208478 9 commit-queue 2016-07-06 18:03:39 -0700 All reviewed patches have been landed. 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