[PATCH AUTOSEL 5.2 123/171] perf stat: Fix use-after-freed pointer detected by the smatch tool

[Sasha Levin]

From: Leo Yan <leo....@linaro.org>

[ Upstream commit c74b05030edb3b52f4208d8415b8c933bc509a29 ]

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....@linaro.org>
Acked-by: Jiri Olsa <jo...@kernel.org>
Cc: Adrian Hunter <adrian.hun...@intel.com>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Alexey Budankov <alexey.budan...@linux.intel.com>
Cc: Alexios Zavras <alexios.zav...@intel.com>
Cc: Andi Kleen <a...@linux.intel.com>
Cc: Changbin Du <changbin...@intel.com>
Cc: Davidlohr Bueso <d...@stgolabs.net>
Cc: David S. Miller <da...@davemloft.net>
Cc: Eric Saint-Etienne <eric.saint.etie...@oracle.com>
Cc: Jin Yao <yao....@linux.intel.com>
Cc: Konstantin Khlebnikov <khlebni...@yandex-team.ru>
Cc: linux-arm-ker...@lists.infradead.org
Cc: Mathieu Poirier <mathieu.poir...@linaro.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Rasmus Villemoes <li...@rasmusvillemoes.dk>
Cc: Song Liu <songliubrav...@fb.com>
Cc: Suzuki Poulouse <suzuki.poul...@arm.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Thomas Richter <tmri...@linux.ibm.com>
Link: http://lkml.kernel.org/r/20190702103420.27540-3-leo....@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Signed-off-by: Sasha Levin <sas...@kernel.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 1ae66f09dc7d..e28002d90573 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1276,8 +1276,8 @@ 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 {
-- 
2.20.1