linux-kernel - [PATCH 02/25] perf stat: Fix use-after-freed pointer detected by the smatch tool

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Date:   Tue,  9 Jul 2019 15:31:03 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Leo Yan <leo.yan@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Changbin Du <changbin.du@...el.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Saint-Etienne <eric.saint.etienne@...cle.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        linux-arm-kernel@...ts.infradead.org,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Song Liu <songliubraving@...com>,
        Suzuki Poulouse <suzuki.poulose@....com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 02/25] perf stat: Fix use-after-freed pointer detected by the smatch tool

From: Leo Yan <leo.yan@...aro.org>

Based on the following report from Smatch, fix the use-after-freed
pointer.

  tools/perf/builtin-stat.c:1353
  add_default_attributes() warn: passing freed memory 'str'.

The pointer 'str' has been freed but later it is still passed into the
function parse_events_print_error().  This patch fixes this
use-after-freed issue.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc: Alexios Zavras <alexios.zavras@...el.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Changbin Du <changbin.du@...el.com>
Cc: Davidlohr Bueso <dave@...olabs.net>
Cc: David S. Miller <davem@...emloft.net>
Cc: Eric Saint-Etienne <eric.saint.etienne@...cle.com>
Cc: Jin Yao <yao.jin@...ux.intel.com>
Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
Cc: Song Liu <songliubraving@...com>
Cc: Suzuki Poulouse <suzuki.poulose@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Thomas Richter <tmricht@...ux.ibm.com>
Link: http://lkml.kernel.org/r/20190702103420.27540-3-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-stat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index e5e19b461061..b81f7b197d24 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1349,8 +1349,8 @@ static int add_default_attributes(void)
 				fprintf(stderr,
 					"Cannot set up top down events %s: %d\n",
 					str, err);
-				free(str);
 				parse_events_print_error(&errinfo, str);
+				free(str);
 				return -1;
 			}
 		} else {
-- 
2.21.0