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SubjectRe: [PATCH 1/3] ARM: perf: Check that current->mm is alive before getting user callchain
On Fri, Jun 27, 2014 at 03:57:45PM +0100, Jean Pihet wrote:
> An event may occur when an mm is already released.
>
> As per commit 20afc60f892d285fde179ead4b24e6a7938c2f1b
> 'x86, perf: Check that current->mm is alive before getting user callchain'
>
> Signed-off-by: Jean Pihet <jean.pihet@linaro.org>
> Cc: Will Deacon <will.deacon@arm.com>
> ---

Acked-by: Will Deacon <will.deacon@arm.com>

> arch/arm/kernel/perf_event.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
> index 4238bcb..6493c4c 100644
> --- a/arch/arm/kernel/perf_event.c
> +++ b/arch/arm/kernel/perf_event.c
> @@ -590,6 +590,10 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
> }
>
> perf_callchain_store(entry, regs->ARM_pc);
> +
> + if (!current->mm)
> + return;
> +
> tail = (struct frame_tail __user *)regs->ARM_fp - 1;
>
> while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
> --
> 1.8.1.2
>
>


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