linux-kernel - [PATCH v1 1/8] perf ui browser: Don't save pointer to stack memory

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Message-Id: <20240507183545.1236093-2-irogers@google.com>
Date: Tue,  7 May 2024 11:35:38 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Oliver Upton <oliver.upton@...ux.dev>, 
	James Clark <james.clark@....com>, Tim Chen <tim.c.chen@...ux.intel.com>, 
	Yicong Yang <yangyicong@...ilicon.com>, K Prateek Nayak <kprateek.nayak@....com>, 
	Yanteng Si <siyanteng@...ngson.cn>, Sun Haiyong <sunhaiyong@...ngson.cn>, 
	Kajol Jain <kjain@...ux.ibm.com>, Ravi Bangoria <ravi.bangoria@....com>, Li Dong <lidong@...o.com>, 
	Paran Lee <p4ranlee@...il.com>, Ben Gainey <ben.gainey@....com>, Andi Kleen <ak@...ux.intel.com>, 
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Subject: [PATCH v1 1/8] perf ui browser: Don't save pointer to stack memory

ui_browser__show is capturing the input title that is stack allocated
memory in hist_browser__run. Avoid a use after return by strdup-ing
the string.

Fixes: 05e8b0804ec4 ("perf ui browser: Stop using 'self'")
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/ui/browser.c | 4 +++-
 tools/perf/ui/browser.h | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/ui/browser.c b/tools/perf/ui/browser.c
index 603d11283cbd..c4cdf2ea69b7 100644
--- a/tools/perf/ui/browser.c
+++ b/tools/perf/ui/browser.c
@@ -287,7 +287,8 @@ int ui_browser__show(struct ui_browser *browser, const char *title,
 	mutex_lock(&ui__lock);
 	__ui_browser__show_title(browser, title);
 
-	browser->title = title;
+	free(browser->title);
+	browser->title = strdup(title);
 	zfree(&browser->helpline);
 
 	va_start(ap, helpline);
@@ -304,6 +305,7 @@ void ui_browser__hide(struct ui_browser *browser)
 	mutex_lock(&ui__lock);
 	ui_helpline__pop();
 	zfree(&browser->helpline);
+	zfree(&browser->title);
 	mutex_unlock(&ui__lock);
 }
 
diff --git a/tools/perf/ui/browser.h b/tools/perf/ui/browser.h
index 510ce4554050..6e98d5f8f71c 100644
--- a/tools/perf/ui/browser.h
+++ b/tools/perf/ui/browser.h
@@ -21,7 +21,7 @@ struct ui_browser {
 	u8	      extra_title_lines;
 	int	      current_color;
 	void	      *priv;
-	const char    *title;
+	char	      *title;
 	char	      *helpline;
 	const char    *no_samples_msg;
 	void 	      (*refresh_dimensions)(struct ui_browser *browser);
-- 
2.45.0.rc1.225.g2a3ae87e7f-goog