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

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Date:	Fri, 3 Oct 2014 12:47:07 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	linux-kernel@...r.kernel.org
Cc:	acme@...hat.com, jolsa@...hat.com, namhyung@...nel.org,
	peterz@...radead.org, mingo@...e.hu, dsahern@...il.com
Subject: [PATCH] perf tools: fix off-by-one error in maps


This patch fixes off-by-one errors in the management
of maps.  A map is defined by start address and length
as implemented by map__new():

map__init(map, type, start, start + len, pgoff, dso);

map__init()
{
  map->start = addr;
  map->end = end;
}

Consequently, the actual address range is ]start; end[
map->end is the first byte outside the range. This patch
fixes two bugs where upper bounds were off-by-one.

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);
--
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