linux-kernel - [tip:perf/urgent] perf hist: Add missing map_

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Date:   Fri, 22 Mar 2019 15:29:58 -0700
From:   tip-bot for Changbin Du <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     namhyung@...nel.org, linux-kernel@...r.kernel.org,
        mingo@...nel.org, jolsa@...nel.org, changbin.du@...il.com,
        peterz@...radead.org, rostedt@...dmis.org, daniel@...earbox.net,
        ast@...nel.org, kjlx@...pleofstupid.com, hpa@...or.com,
        tglx@...utronix.de, acme@...hat.com
Subject: [tip:perf/urgent] perf hist: Add missing map__put() in error case

Commit-ID:  cb6186aeffda4d27e56066c79e9579e7831541d3
Gitweb:     https://git.kernel.org/tip/cb6186aeffda4d27e56066c79e9579e7831541d3
Author:     Changbin Du <changbin.du@...il.com>
AuthorDate: Sat, 16 Mar 2019 16:05:49 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 19 Mar 2019 16:52:04 -0300

perf hist: Add missing map__put() in error case

We need to map__put() before returning from failure of
sample__resolve_callchain().

Detected with gcc's ASan.

Signed-off-by: Changbin Du <changbin.du@...il.com>
Reviewed-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Krister Johansen <kjlx@...pleofstupid.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
Fixes: 9c68ae98c6f7 ("perf callchain: Reference count maps")
Link: http://lkml.kernel.org/r/20190316080556.3075-10-changbin.du@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/hist.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 1f230285d78a..7ace7a10054d 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1111,8 +1111,10 @@ int hist_entry_iter__add(struct hist_entry_iter *iter, struct addr_location *al,
 
 	err = sample__resolve_callchain(iter->sample, &callchain_cursor, &iter->parent,
 					iter->evsel, al, max_stack_depth);
-	if (err)
+	if (err) {
+		map__put(alm);
 		return err;
+	}
 
 	err = iter->ops->prepare_entry(iter, al);
 	if (err)