[Webkit-unassigned] [Bug 153912] New: Modern IDB: UniqueIDBDatabase's m_databaseInfo is used from multiple threads

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153912

            Bug ID: 153912
           Summary: Modern IDB: UniqueIDBDatabase's m_databaseInfo is used
                    from multiple threads
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: beidson at apple.com

Modern IDB: UniqueIDBDatabase's m_databaseInfo is used from multiple threads

It's meant to be assigned and used on the main thread, but in UniqueIDBDatabase::performPutOrAdd, which is a database thread method:
    auto objectStoreInfo = m_databaseInfo->infoForExistingObjectStore(objectStoreIdentifier);

Yikes!

Noticed this in a random audit, don't know of any actual fallout, but it's obviously not safe.

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