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

[Arun Sharma]

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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