perf maps: Fix map__clone() for struct kmap

The map__clone() function can be called on kernel maps as well, so it
needs to duplicate the whole kmap data.

Reported-by: Ravi Bangoria <[e-mail]>
Signed-off-by: Jiri Olsa <[e-mail]>
Tested-by: Ravi Bangoria <[e-mail]>
Tested-by: Kim Phillips <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Michael Petlan <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/map.c

···
 
 struct map *map__clone(struct map *from)
 {
-	struct map *map = memdup(from, sizeof(*map));
+	size_t size = sizeof(struct map);
+	struct map *map;
 
+	if (from->dso && from->dso->kernel)
+		size += sizeof(struct kmap);
+
+	map = memdup(from, size);
 	if (map != NULL) {
 		refcount_set(&map->refcnt, 1);
 		RB_CLEAR_NODE(&map->rb_node);