Re: [Patch] Incoming XPC channel messages can come in after thechannel's partition structures have been torn down.

[Robin Holt]

On Mon, Oct 18, 2010 at 12:40:55PM -0700, Andrew Morton wrote:
> On Mon, 18 Oct 2010 08:35:08 -0500
> Robin Holt <holt@xxxxxxx> wrote:
> 
> > Under some workloads, some channel messages have been observed being
> > delayed on the sending side past the point where the receiving side
> > has been able to tear down its partition structures.  This condition is
> > already detected in xpc_handle_activate_IRQ_uv(), but that information
> > is not given to xpc_handle_activate_mq_msg_uv().  As a result,
> > xpc_handle_activate_mq_msg_uv() assumes the structures still exist and
> > references them.
> 
> With what result?  Machine goes boom?
> 
> Would you consider this a 2.6.36 fix?  Backport to -stable?

I would consider it a backport to stable.  It is a NULL pointer deref.
This pach applies back to 2.6.32.  I did not try older kernels than
that.

Robin
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