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From:   Leo Yan <leo.yan@linaro.org>
To:     Arnaldo Carvalho de Melo <acme@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
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        Jiri Olsa <jolsa@redhat.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
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        "David S. Miller" <davem@davemloft.net>,
        Davidlohr Bueso <dave@stgolabs.net>,
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        Jin Yao <yao.jin@linux.intel.com>,
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        Alexey Budankov <alexey.budankov@linux.intel.com>,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc:     Leo Yan <leo.yan@linaro.org>
Subject: [PATCH v1 02/11] perf stat: Smatch: Fix use-after-freed pointer
Date:   Tue,  2 Jul 2019 18:34:11 +0800
Message-Id: <20190702103420.27540-3-leo.yan@linaro.org>
In-Reply-To: <20190702103420.27540-1-leo.yan@linaro.org>
References: <20190702103420.27540-1-leo.yan@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@linaro.org>
---
 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 8a35fc5a7281..de0f6d0e96a2 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 {
-- 
2.17.1