linux-kernel - [PATCH v2 1/3] perf probe: Fix memory leak in synthesize_sdt_probe

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Date:   Fri, 25 Dec 2020 13:27:49 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexandre Truong <alexandre.truong@....com>,
        Ian Rogers <irogers@...gle.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        He Zhe <zhe.he@...driver.com>,
        Sumanth Korikkar <sumanthk@...ux.ibm.com>,
        Alexis Berlemont <alexis.berlemont@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Leo Yan <leo.yan@...aro.org>, stable@...r.kernel.org
Subject: [PATCH v2 1/3] perf probe: Fix memory leak in synthesize_sdt_probe_command()

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

In synthesize_sdt_probe_command(), it gets argument array from
argv_split() but forgets to free it.  This patch calls argv_free() to
free the argument array to avoid memory leak.

Fixes: 3b1f8311f696 ("perf probe: Add sdt probes arguments into the uprobe cmd string")
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Leo Yan <leo.yan@...aro.org>
Cc: stable@...r.kernel.org
---
 tools/perf/util/probe-file.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 064b63a6a3f3..bbecb449ea94 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -791,7 +791,7 @@ static char *synthesize_sdt_probe_command(struct sdt_note *note,
 					const char *sdtgrp)
 {
 	struct strbuf buf;
-	char *ret = NULL, **args;
+	char *ret = NULL;
 	int i, args_count, err;
 	unsigned long long ref_ctr_offset;
 
@@ -813,12 +813,19 @@ static char *synthesize_sdt_probe_command(struct sdt_note *note,
 		goto out;
 
 	if (note->args) {
-		args = argv_split(note->args, &args_count);
+		char **args = argv_split(note->args, &args_count);
+
+		if (args == NULL)
+			goto error;
 
 		for (i = 0; i < args_count; ++i) {
-			if (synthesize_sdt_probe_arg(&buf, i, args[i]) < 0)
+			if (synthesize_sdt_probe_arg(&buf, i, args[i]) < 0) {
+				argv_free(args);
 				goto error;
+			}
 		}
+
+		argv_free(args);
 	}
 
 out:
-- 
2.17.1