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

[Vince Weaver]

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@xxxxxxxxx>

Thanks,

Vince
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