Em Fri, Oct 03, 2014 at 12:47:07PM +0200, Stephane Eranian escreveu:
>
> 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
I thought map->end should be the end of the range, not something after
the end, is that really the case?
I.e. the bug would be in that call to map__init, that should instead be:
map__init(map, type, start, start + len - 1, pgoff, dso);
no? Isn't that clearer, i.e. to keep the semantics of 'end'?
- Arnaldo
> fixes two bugs where upper bounds were off-by-one.
>
> Signed-off-by: Stephane Eranian <[email protected]>
>
> 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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