linux-kernel - Re: [PATCH] perf tools: fix off-by-one error in maps

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Message-ID: <20141005192312.GA10245@krava.redhat.com>
Date:	Sun, 5 Oct 2014 21:23:12 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, namhyung@...nel.org,
	peterz@...radead.org, mingo@...e.hu, dsahern@...il.com
Subject: Re: [PATCH] perf tools: fix off-by-one error in maps

On Fri, Oct 03, 2014 at 12:47:07PM +0200, Stephane Eranian wrote:
> 

SNIP

> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> 
> diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> index b709059..9e2c71e 100644
> --- a/tools/perf/util/map.c
> +++ b/tools/perf/util/map.c
> @@ -556,7 +556,7 @@ struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
>  
>  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) {
> +	if (ams->addr < ams->map->start || ams->addr >= ams->map->end) {
>  		if (ams->map->groups == NULL)
>  			return -1;
>  		ams->map = map_groups__find(ams->map->groups, ams->map->type,
> @@ -678,7 +678,7 @@ int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
>  				goto move_map;
>  			}
>  
> -			after->start = map->end + 1;
> +			after->start = map->end;
>  			map_groups__insert(mg, after);
>  			if (verbose >= 2)
>  				map__fprintf(after, fp);

hum, do we also need this one then?

---
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 9e2c71e51fce..186418ba18db 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -664,7 +664,7 @@ int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
 				goto move_map;
 			}
 
-			before->end = map->start - 1;
+			before->end = map->start;
 			map_groups__insert(mg, before);
 			if (verbose >= 2)
 				map__fprintf(before, fp);
--
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