linux-kernel - [tip:perf/core] perf ui/tui: Fix off-by-one in hist_browser__update_nr

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Message-ID: <tip-c481f9301183260a78e55fa4d70d977b68c81846@git.kernel.org>
Date:	Fri, 25 Apr 2014 06:14:46 -0700
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	jolsa@...nel.org, tglx@...utronix.de, namhyung@...nel.org
Subject: [tip:perf/core] perf ui/tui:
  Fix off-by-one in hist_browser__update_nr_entries()

Commit-ID:  c481f9301183260a78e55fa4d70d977b68c81846
Gitweb:     http://git.kernel.org/tip/c481f9301183260a78e55fa4d70d977b68c81846
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Tue, 22 Apr 2014 13:56:11 +0900
Committer:  Jiri Olsa <jolsa@...nel.org>
CommitDate: Thu, 24 Apr 2014 16:33:08 +0200

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@...nel.org>
Link: http://lkml.kernel.org/r/1398327843-31845-9-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/ui/browsers/hists.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 4d41698..311226e 100644
--- 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;
--
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