linux-kernel - [PATCH AUTOSEL 4.14 112/127] perf parse-events: Fix incorrect conversion of 'if () free()' to 'zfree()'

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Message-Id: <20200918021220.2066485-112-sashal@kernel.org>
Date:   Thu, 17 Sep 2020 22:12:05 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        clang-built-linux@...glegroups.com, Jiri Olsa <jolsa@...nel.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephane Eranian <eranian@...gle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.14 112/127] perf parse-events: Fix incorrect conversion of 'if () free()' to 'zfree()'

From: Arnaldo Carvalho de Melo <acme@...hat.com>

[ Upstream commit 7fcdccd4237724931d9773d1e3039bfe053a6f52 ]

When applying a patch by Ian I incorrectly converted to zfree() an
expression that involved testing some other struct member, not the one
being freed, which lead to bugs reproduceable by:

  $ perf stat -e i/bs,tsc,L2/o sleep 1
  WARNING: multiple event parsing errors
  Segmentation fault (core dumped)
  $

Fix it by restoring the test for pos->free_str before freeing
pos->val.str, but continue using zfree(&pos->val.str) to set that member
to NULL after freeing it.

Reported-by: Ian Rogers <irogers@...gle.com>
Fixes: e8dfb81838b1 ("perf parse-events: Fix memory leaks found on parse_events")
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: clang-built-linux@...glegroups.com
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Leo Yan <leo.yan@...aro.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/util/parse-events.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 2733cdfdf04c6..ba973bdfaa657 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1258,7 +1258,8 @@ static int __parse_events_add_pmu(struct parse_events_state *parse_state,
 
 		list_for_each_entry_safe(pos, tmp, &config_terms, list) {
 			list_del_init(&pos->list);
-			zfree(&pos->val.str);
+			if (pos->free_str)
+				zfree(&pos->val.str);
 			free(pos);
 		}
 		return -EINVAL;
-- 
2.25.1