[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 #4 from Ali Juma <ajuma at chromium.org> ---
(In reply to Cameron McCormack (:heycam) from comment #3)
> 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.

Thanks for having a look. A large fraction of the crash reports are happening when free memory is low, so it's probably the ShareableBitmapMalloc::tryMalloc call failing.

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