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Issue 404012: Ensure that the refcount on InternalGetCommandRequest stays non-zero through a PostTask (Closed)

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7 years, 5 months ago by jamesr
5 years, 10 months ago


Ensure that the refcount on InternalGetCommandRequest stays non-zero through a PostTask The problem was that BaseSessionService::ScheduleGetLastSessionCommands() was posting a task with a InternalGetCommandsRequest* request parameter by calling NewRunnableMethod(.., &SessionBackend::ReadLastSessionCommands, request). SessnionBackend::ReadLastSessionCommands takes one parameter of type scoped_refptr<InternalGetCommandsRequest>. However, NewRunnableMethod was matching the template because an InternalGetCommandsRequest* is implicitly convertable to a scoped_refptr<InternalGetCommandsRequest> but it was not actually creating the scoped_refptr<> (and thus bumping the refcount) until the task was dispatched. By this time the refcount on the InternalGetCommandsRequest had already dropped to zero, leading to memory corruption. This fixes the problem by passing a scoped_refptr<...> in to NewRunnableMethod() to ensure that it is copied and that the refcount stays up. TEST=covered by TabRestoreUITest.RestoreIntoSameWindow - caused very intermittend failures locally BUG=none Committed:

Patch Set 1 #

Unified diffs Side-by-side diffs Delta from patch set Stats (+1 line, -1 line) Patch
M chrome/browser/sessions/ View 1 chunk +1 line, -1 line 0 comments Download
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Total messages: 2 (0 generated)
The failure reproduces much more reliably if the PostTask() is changed to a PostDelayedTask() with ...
7 years, 5 months ago (2009-11-17 23:53:43 UTC) #1
7 years, 5 months ago (2009-11-18 00:10:13 UTC) #2
great catch.  that's crazy though.  can we prevent this from happening again,
either through compile/runtime checks?
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