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From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Namhyung Kim <namhyung@kernel.org>,
	David Ahern <dsahern@gmail.com>, Andi Kleen <andi@firstfloor.org>,
	Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH 08/10] perf values: Zero value buffers
Date: Thu, 24 Aug 2017 18:27:35 +0200
Message-ID: <20170824162737.7813-9-jolsa@kernel.org> (raw)
In-Reply-To: <20170824162737.7813-1-jolsa@kernel.org>

We need to make sure the array of value pointers are zero
initialized, because we use them in realloc later on and
uninitialized non zero value will cause allocation error
and aborted execution.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/values.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/values.c b/tools/perf/util/values.c
index 2c4af02f08cd..3b56aeaa8cbb 100644
--- a/tools/perf/util/values.c
+++ b/tools/perf/util/values.c
@@ -12,7 +12,7 @@ int perf_read_values_init(struct perf_read_values *values)
 	values->threads_max = 16;
 	values->pid = malloc(values->threads_max * sizeof(*values->pid));
 	values->tid = malloc(values->threads_max * sizeof(*values->tid));
-	values->value = malloc(values->threads_max * sizeof(*values->value));
+	values->value = zalloc(values->threads_max * sizeof(*values->value));
 	if (!values->pid || !values->tid || !values->value) {
 		pr_debug("failed to allocate read_values threads arrays");
 		goto out_free_pid;
@@ -99,7 +99,8 @@ static int perf_read_values__findnew_thread(struct perf_read_values *values,
 	}
 
 	i = values->threads;
-	values->value[i] = malloc(values->counters_max * sizeof(**values->value));
+
+	values->value[i] = zalloc(values->counters_max * sizeof(**values->value));
 	if (!values->value[i]) {
 		pr_debug("failed to allocate read_values counters array");
 		return -ENOMEM;
@@ -130,12 +131,16 @@ static int perf_read_values__enlarge_counters(struct perf_read_values *values)
 
 	for (i = 0; i < values->threads; i++) {
 		u64 *value = realloc(values->value[i], counters_max * sizeof(**values->value));
+		int j;
 
 		if (!value) {
 			pr_debug("failed to enlarge read_values ->values array");
 			goto out_free_name;
 		}
 
+		for (j = values->counters_max; j < counters_max; j++)
+			value[j] = 0;
+
 		values->value[i] = value;
 	}
 
-- 
2.9.5

  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-24 16:27 [PATCH 00/10] perf: inherit_stat related fixes Jiri Olsa
2017-08-24 16:27 ` [PATCH 01/10] perf/x86: Add warning on proper cpu during event's update Jiri Olsa
2017-08-28 19:24   ` Peter Zijlstra
2017-08-24 16:27 ` [PATCH 02/10] perf: Fix leader for removed sibling event in perf_group_detach Jiri Olsa
2017-08-28 19:23   ` Peter Zijlstra
2017-08-24 16:27 ` [PATCH 03/10] perf: Make sure we read only scheduled events Jiri Olsa
2017-08-28 19:23   ` Peter Zijlstra
2017-09-01  7:21     ` Jiri Olsa
2017-08-24 16:27 ` [PATCH 04/10] perf record: Set read_format for inherit_stat Jiri Olsa
2017-08-29 21:20   ` [tip:perf/core] " tip-bot for Jiri Olsa
2017-08-24 16:27 ` [PATCH 05/10] perf report: Add dump_read function Jiri Olsa
2017-08-29 21:20   ` [tip:perf/core] " tip-bot for Jiri Olsa
2017-08-24 16:27 ` [PATCH 06/10] perf values: Fix thread index bug Jiri Olsa
2017-08-29 21:21   ` [tip:perf/core] " tip-bot for Jiri Olsa
2017-08-24 16:27 ` [PATCH 07/10] perf values: Fix allocation check Jiri Olsa
2017-08-29 21:21   ` [tip:perf/core] " tip-bot for Jiri Olsa
2017-08-24 16:27 ` Jiri Olsa [this message]
2017-08-29 21:21   ` [tip:perf/core] perf values: Zero value buffers tip-bot for Jiri Olsa
2017-08-24 16:27 ` [PATCH 09/10] perf report: Group stat values on global event id Jiri Olsa
2017-08-29 21:22   ` [tip:perf/core] " tip-bot for Jiri Olsa
2017-08-24 16:27 ` [PATCH 10/10] perf stat: Support inherit/no-inherit terms Jiri Olsa
2017-08-24 16:30   ` Andi Kleen
2017-08-24 16:45     ` Jiri Olsa
2017-08-25 18:57       ` Arnaldo Carvalho de Melo

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