linux-kernel - Re: [PATCH] perf tools: Fix mmap2 event allocation in synthesize code

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Date:	Wed, 6 Jan 2016 12:15:49 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	jolsa@...nel.org, acme@...nel.org, linux-kernel@...r.kernel.org,
	pi3orama@....com, lizefan@...wei.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	He Kuang <hekuang@...wei.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH] perf tools: Fix mmap2 event allocation in synthesize code

On Wed, Jan 06, 2016 at 03:41:23AM +0000, Wang Nan wrote:
> perf_event__synthesize_mmap_events() issues mmap2 events, but the
> memory of that event is allocated using:
> 
>  mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
> 
> If path of mmap source file is long (near PATH_MAX), random crash
> would happen. Should use sizeof(mmap_event->mmap2).
> 
> Fix two memory allocations and rename all mmap_event to mmap2_event
> to make it clear.

nice one..

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka
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