[Webkit-unassigned] [Bug 217668] New: Null dereference in PDFPlugin::snapshot()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217668

            Bug ID: 217668
           Summary: Null dereference in PDFPlugin::snapshot()
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: PDF
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: julian_a_gonzalez at apple.com

Created attachment 411254

  --> https://bugs.webkit.org/attachment.cgi?id=411254&action=review

Crash log

In PDFPlugin::snapshot(), it's possible to dereference nullptr:

RefPtr<ShareableBitmap> PDFPlugin::snapshot()
{
...
    auto bitmap = ShareableBitmap::createShareable(backingStoreSize, { });
    auto context = bitmap->createGraphicsContext();
    if (!context)
        return nullptr;
...
}

bitmap here can be nullptr, so it must be checked before use.
Attaching a crash log.

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