perf ui/tui: Fix off-by-one in hist_browser__update_nr_entries()

The nr_entries variable is increased inside the loop in the function
but it always count the first entry regardless of it's filtered or
not; caused an off-by-one error.

It'd become a problem especially there's no entry at all - it'd get a
segfault during referencing a NULL pointer.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1398327843-31845-9-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 4d41698..311226e 100644 (file)
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1348,10 +1348,10 @@ static void hist_browser__update_pcnt_entries(struct hist_browser *hb)
        u64 nr_entries = 0;
        struct rb_node *nd = rb_first(&hb->hists->entries);
 
-       while (nd) {
+       while ((nd = hists__filter_entries(nd, hb->hists,
+                                          hb->min_pcnt)) != NULL) {
                nr_entries++;
-               nd = hists__filter_entries(rb_next(nd), hb->hists,
-                                          hb->min_pcnt);
+               nd = rb_next(nd);
        }
 
        hb->nr_pcnt_entries = nr_entries;