linux-kernel - [tip:perf/core] perf probe: Release allocated probe_trace

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Message-ID: <tip-981d05adf2e2acc328abb929a6ed3536c0d41c5f@git.kernel.org>
Date:	Sun, 19 Jan 2014 04:24:39 -0800
From:	tip-bot for Masami Hiramatsu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, mingo@...hat.com,
	dave.long@...aro.org, hpa@...or.com, mingo@...nel.org,
	namhyung@...nel.org, masami.hiramatsu.pt@...achi.com,
	rostedt@...dmis.org, srikar@...ux.vnet.ibm.com, dsahern@...il.com,
	oleg@...hat.com, tglx@...utronix.de
Subject: [tip:perf/core] perf probe:
  Release allocated probe_trace_event if failed

Commit-ID:  981d05adf2e2acc328abb929a6ed3536c0d41c5f
Gitweb:     http://git.kernel.org/tip/981d05adf2e2acc328abb929a6ed3536c0d41c5f
Author:     Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
AuthorDate: Thu, 16 Jan 2014 09:39:44 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 16 Jan 2014 16:26:50 -0300

perf probe: Release allocated probe_trace_event if failed

To fix a memory leak, release all allocated probe_trace_event on the
error path of try_to_find_probe_trace_events.

Reported-by: David Ahern <dsahern@...il.com>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: "David A. Long" <dave.long@...aro.org>
Cc: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: yrl.pp-manager.tt@...achi.com
Link: http://lkml.kernel.org/r/20140116093944.24403.30228.stgit@kbuild-fedora.novalocal
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/probe-event.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index a4ee6b4..579b655 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -72,6 +72,7 @@ static int e_snprintf(char *str, size_t size, const char *format, ...)
 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
 static int convert_name_to_addr(struct perf_probe_event *pev,
 				const char *exec);
+static void clear_probe_trace_event(struct probe_trace_event *tev);
 static struct machine machine;
 
 /* Initialize symbol maps and path of vmlinux/modules */
@@ -407,6 +408,14 @@ static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
 	return ret;
 }
 
+static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
+{
+	int i;
+
+	for (i = 0; i < ntevs; i++)
+		clear_probe_trace_event(tevs + i);
+}
+
 /* Try to find perf_probe_event with debuginfo */
 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
 					  struct probe_trace_event **tevs,
@@ -442,6 +451,10 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
 				ret = add_module_to_probe_trace_events(*tevs,
 						 ntevs, target);
 		}
+		if (ret < 0) {
+			clear_probe_trace_events(*tevs, ntevs);
+			zfree(tevs);
+		}
 		return ret < 0 ? ret : ntevs;
 	}
 
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