[PATCH, v5.4] perf: Correctly handle failed perf_get_aux_event()

[Ingo Molnar]

* Vince Weaver <vincent.weaver@xxxxxxxxx> wrote:

> On Mon, 6 Jan 2020, Vince Weaver wrote:
> 
> > On Mon, 6 Jan 2020, Mark Rutland wrote:
> > 
> > > On Thu, Jan 02, 2020 at 02:22:47PM -0500, Vince Weaver wrote:
> > > > On Thu, 2 Jan 2020, Vince Weaver wrote:
> > > > 
> > > Vince, does the below (untested) patch work for you?
> > 
> > 
> > yes, this patch fixes things for me.
> > 
> > Tested-by: Vince Weaver <vincent.weaver@xxxxxxxxx>
> > 
> 
> is this patch going to make it upstream?  It's a fairly major correctness 
> bug with perf_event_open().

I just sent it to Linus.

In hindsight this should have been marked Cc: stable for v5.4 - we should 
forward it to Greg once Linus has pulled it:

   da9ec3d3dd0f: ("perf: Correctly handle failed perf_get_aux_event()")


Note that in the v5.4 cherry-pick there's a conflict due to interaction 
with another recent commit - I've attached the ported fix against v5.4, 
but have only test built it.

Thanks,

	Ingo

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