linux-kernel - Re: [PATCH] perf: fix infinite loop with corrupted header

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Message-ID: <20130926134640.GA26159@ghostprotocols.net>
Date:	Thu, 26 Sep 2013 10:46:40 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	Sonny Rao <sonnyrao@...omium.org>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf: fix infinite loop with corrupted header

Em Thu, Sep 26, 2013 at 07:34:56AM -0600, David Ahern escreveu:
> On 9/25/13 11:20 PM, Sonny Rao wrote:
> >We recently ran into a corrupt perf data file which mostly looked okay
> >but the section size for data was set to 0.  This caused perf report to
> >get into an infinite loop in __perf_session_process_events().  Let's
> >just avoid this by bailing early and reporting it if there's an
> >invalid header.
> 
> Been suggested before:
> https://lkml.org/lkml/2013/5/9/405

Thanks for the pointer (and this latest patch as well), looking at it
now.

- Arnaldo
 
> Other changes went in around that time as well. Are you still seeing
> the loop on latest source?
> 
> David
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