linux-kernel - Re: [PATCH] [perf] Add inverted call graph report support.

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Date:	Thu, 9 Jun 2011 12:33:00 -0700
From:	Arun Sharma <asharma@...com>
To:	Sam Liao <phyomh@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] [perf] Add inverted call graph report support.

On Thu, Jun 09, 2011 at 02:44:19PM +0800, Sam Liao wrote:
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -247,9 +247,14 @@ int perf_session__resolve_callchain(struct
> perf_session *self,
>  	callchain_cursor_reset(&self->callchain_cursor);
> 
>  	for (i = 0; i < chain->nr; i++) {
> -		u64 ip = chain->ips[i];
> +		u64 ip;
>  		struct addr_location al;
> 
> +		if (callchain_param.order == ORDER_CALLEE)
> +			ip = chain->ips[i];
> +		else
> +			ip = chain->ips[chain->nr - i - 1];

This can dereference a bad pointer if chain->nr == 0.

 -Arun
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