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

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Message-ID: <4DF12974.7030707@fb.com>
Date:	Thu, 09 Jun 2011 13:13:40 -0700
From:	Arun Sharma <asharma@...com>
To:	David Ahern <dsahern@...il.com>
CC:	Sam Liao <phyomh@...il.com>, 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 6/9/11 1:10 PM, David Ahern wrote:
>
>
> On 06/09/2011 01:33 PM, Arun Sharma wrote:
>> 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.
>
> Should not enter the loop if chain->nr is 0 (See for arg).

Ah right. I had this problem with an earlier version of the patch. This 
version seems to be fine.

  -Arun
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