linux-kernel - Re: [PATCH] perf tools: fix missing default initialization for tool->mmap2

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Date:	Tue, 8 Oct 2013 13:59:29 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, bitbucket@...ine.de, acme@...hat.com,
	peterz@...radead.org, mingo@...e.hu
Subject: Re: [PATCH] perf tools: fix missing default initialization for
 tool->mmap2


* Stephane Eranian <eranian@...gle.com> wrote:

> 
> This patch fixes a SEGFAULT bug with perf sched
> related to the new MMAP2 record type. There was
> a missing default initialization for the tool->mmap2
> pointer in perf_tool__fill_defaults().
> 
> Reproducer:
>  # perf sched record -- sleep 1
>  # perf sched lat
> 
> Reported-by: Mike Galbraith <bitbucket@...ine.de>
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> --
> 
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 211b325..8415c54 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -256,6 +256,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
>  		tool->sample = process_event_sample_stub;
>  	if (tool->mmap == NULL)
>  		tool->mmap = process_event_stub;
> +	if (tool->mmap2 == NULL)
> +		tool->mmap2 = process_event_stub;
>  	if (tool->comm == NULL)
>  		tool->comm = process_event_stub;
>  	if (tool->fork == NULL)

I think it's already fixed in tip:perf/urgent:

  6adb0b0ae26f perf tools: Add default handler for mmap2 events

Thanks,

	Ingo
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