[Webkit-unassigned] [Bug 233217] [iOS 15] Nullptr crashes in ShareableBitmap::createGraphicsContext, mostly on twitter.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233217

--- Comment #3 from Cameron McCormack (:heycam) <heycam at apple.com> ---
It's possible ShareableBitmap::create returned null due to either numBytes overflowing  (though that would require something like a 32k x 32k image) or the ShareableBitmapMalloc::tryMalloc call failing.  Either way, PageClientImpl::startDrag should probably defend against ShareableBitmap::create returning null.

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