linux-kernel - Re: perf,arm -- another (different) fuzzer oops

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Date:	Wed, 7 Aug 2013 22:31:28 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Stephen Boyd <sboyd@...eaurora.org>
cc:	Will Deacon <will.deacon@....com>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"trinity@...r.kernel.org" <trinity@...r.kernel.org>
Subject: Re: perf,arm -- another (different) fuzzer oops

On Wed, 7 Aug 2013, Stephen Boyd wrote:

> ---8<----
> 
> diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
> index d9f5cd4..21f7790 100644
> --- a/arch/arm/kernel/perf_event.c
> +++ b/arch/arm/kernel/perf_event.c
> @@ -53,7 +53,12 @@ armpmu_map_cache_event(const unsigned (*cache_map)
>  static int
>  armpmu_map_hw_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config)
>  {
> -       int mapping = (*event_map)[config];
> +       int mapping;
> +
> +       if (config >= PERF_COUNT_HW_MAX)
> +               return -ENOENT;
> +
> +       mapping = (*event_map)[config];
>         return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping;
>  }

I've tested this patch and my testcase no longer causes the kernel to 
oops, so 

Tested-by: Vince Weaver <vincent.weaver@...ne.edu>

Thanks,

Vince
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