linux-kernel - Re: [BUG] perf tools: off-by-one error in map_groups__find

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Date:	Thu, 2 Oct 2014 10:36:35 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>, David Ahern <dsahern@...il.com>
Subject: Re: [BUG] perf tools: off-by-one error in map_groups__find_ams()

On Wed, Oct 01, 2014 at 09:16:31PM +0200, Stephane Eranian wrote:
> Hi,
> 
> It appears that there is a off-by-one bug in map_groups__find_ams().
> The upper-bound check in the test below should be >= because
> end = start + len; The end address is outside the range.
> 
> Please confirm.
> 
> 
> int map_groups__find_ams(struct addr_map_symbol *ams, symbol_filter_t filter)
> {
>                 if (ams->addr < ams->map->start || ams->addr > ams->map->end) {

yep, looks like bug to me

jirka
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