linux-kernel - [PATCH 03/10] perf hists browser: Fix possible memory leak

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Message-Id: <1429687101-4360-4-git-send-email-namhyung@kernel.org>
Date:	Wed, 22 Apr 2015 16:18:14 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>
Subject: [PATCH 03/10] perf hists browser: Fix possible memory leak

The options array saves strings for each popup menu item.  The number of
items can be vary according to the currently selected item.  So it can
leak some memory if it's exited from a small item.  Fix it by freeing
all items when loop terminates.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/ui/browsers/hists.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 995b7a8596b1..0972d4722297 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1424,7 +1424,8 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
 	struct hist_browser *browser = hist_browser__new(hists);
 	struct branch_info *bi;
 	struct pstack *fstack;
-	char *options[16];
+#define MAX_OPTIONS  16
+	char *options[MAX_OPTIONS];
 	int nr_options = 0;
 	int key = -1;
 	char buf[64];
@@ -1691,7 +1692,8 @@ skip_annotation:
 				"Switch to another data file in PWD") > 0)
 			switch_data = nr_options++;
 add_exit_option:
-		options[nr_options++] = (char *)"Exit";
+		if (asprintf(&options[nr_options], "Exit") > 0)
+			nr_options++;
 retry_popup_menu:
 		choice = ui__popup_menu(nr_options, options);
 
@@ -1812,7 +1814,7 @@ out_free_stack:
 	pstack__delete(fstack);
 out:
 	hist_browser__delete(browser);
-	free_popup_options(options, nr_options - 1);
+	free_popup_options(options, MAX_OPTIONS);
 	return key;
 }
 
-- 
2.3.5

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