[tip:perf/core] perf hists browser: Fix possible memory leak

[tip-bot for Namhyung Kim]

Commit-ID:  f2b487db45f2aa203892384f6a08f0a761edad5d
Gitweb:     http://git.kernel.org/tip/f2b487db45f2aa203892384f6a08f0a761edad5d
Author:     Namhyung Kim <namhyung@xxxxxxxxxx>
AuthorDate: Wed, 22 Apr 2015 16:18:14 +0900
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 5 May 2015 18:13:13 -0300

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@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1429687101-4360-4-git-send-email-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 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 995b7a8..0972d47 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;
 }
 
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