From: Sasha Levin <sashal@kernel•org>
To: linux-kernel@vger•kernel.org, stable@vger•kernel.org
Cc: Song Liu <songliubraving@fb•com>,
Konstantin Khlebnikov <khlebnikov@yandex-team•ru>,
Rasmus Villemoes <linux@rasmusvillemoes•dk>,
Jin Yao <yao.jin@linux•intel.com>,
Sasha Levin <sashal@kernel•org>, Andi Kleen <ak@linux•intel.com>,
Alexey Budankov <alexey.budankov@linux•intel.com>,
Alexander Shishkin <alexander.shishkin@linux•intel.com>,
Suzuki Poulouse <suzuki.poulose@arm•com>,
Arnaldo Carvalho de Melo <acme@redhat•com>,
Alexios Zavras <alexios.zavras@intel•com>,
Davidlohr Bueso <dave@stgolabs•net>,
Namhyung Kim <namhyung@kernel•org>,
Thomas Gleixner <tglx@linutronix•de>,
linux-arm-kernel@lists•infradead.org,
Mathieu Poirier <mathieu.poirier@linaro•org>,
Thomas Richter <tmricht@linux•ibm.com>,
Adrian Hunter <adrian.hunter@intel•com>,
"David S . Miller" <davem@davemloft•net>,
Changbin Du <changbin.du@intel•com>,
Peter Zijlstra <peterz@infradead•org>,
Jiri Olsa <jolsa@kernel•org>, Leo Yan <leo.yan@linaro•org>,
Eric Saint-Etienne <eric.saint.etienne@oracle•com>
Subject: [PATCH AUTOSEL 5.1 100/141] perf session: Fix potential NULL pointer dereference found by the smatch tool
Date: Fri, 19 Jul 2019 00:02:05 -0400 [thread overview]
Message-ID: <20190719040246.15945-100-sashal@kernel.org> (raw)
In-Reply-To: <20190719040246.15945-1-sashal@kernel.org>
From: Leo Yan <leo.yan@linaro•org>
[ Upstream commit f3c8d90757724982e5f07cd77d315eb64ca145ac ]
Based on the following report from Smatch, fix the potential
NULL pointer dereference check.
tools/perf/util/session.c:1252
dump_read() error: we previously assumed 'evsel' could be null
(see line 1249)
tools/perf/util/session.c
1240 static void dump_read(struct perf_evsel *evsel, union perf_event *event)
1241 {
1242 struct read_event *read_event = &event->read;
1243 u64 read_format;
1244
1245 if (!dump_trace)
1246 return;
1247
1248 printf(": %d %d %s %" PRIu64 "\n", event->read.pid, event->read.tid,
1249 evsel ? perf_evsel__name(evsel) : "FAIL",
1250 event->read.value);
1251
1252 read_format = evsel->attr.read_format;
^^^^^^^
'evsel' could be NULL pointer, for this case this patch directly bails
out without dumping read_event.
Signed-off-by: Leo Yan <leo.yan@linaro•org>
Acked-by: Jiri Olsa <jolsa@kernel•org>
Cc: Adrian Hunter <adrian.hunter@intel•com>
Cc: Alexander Shishkin <alexander.shishkin@linux•intel.com>
Cc: Alexey Budankov <alexey.budankov@linux•intel.com>
Cc: Alexios Zavras <alexios.zavras@intel•com>
Cc: Andi Kleen <ak@linux•intel.com>
Cc: Changbin Du <changbin.du@intel•com>
Cc: David S. Miller <davem@davemloft•net>
Cc: Davidlohr Bueso <dave@stgolabs•net>
Cc: Eric Saint-Etienne <eric.saint.etienne@oracle•com>
Cc: Jin Yao <yao.jin@linux•intel.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team•ru>
Cc: Mathieu Poirier <mathieu.poirier@linaro•org>
Cc: Namhyung Kim <namhyung@kernel•org>
Cc: Peter Zijlstra <peterz@infradead•org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes•dk>
Cc: Song Liu <songliubraving@fb•com>
Cc: Suzuki Poulouse <suzuki.poulose@arm•com>
Cc: Thomas Gleixner <tglx@linutronix•de>
Cc: Thomas Richter <tmricht@linux•ibm.com>
Cc: linux-arm-kernel@lists•infradead.org
Link: http://lkml.kernel.org/r/20190702103420.27540-9-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat•com>
Signed-off-by: Sasha Levin <sashal@kernel•org>
---
tools/perf/util/session.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index bad5f87ae001..656ef536b3ab 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1147,6 +1147,9 @@ static void dump_read(struct perf_evsel *evsel, union perf_event *event)
evsel ? perf_evsel__name(evsel) : "FAIL",
event->read.value);
+ if (!evsel)
+ return;
+
read_format = evsel->attr.read_format;
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
--
2.20.1
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next prev parent reply other threads:[~2019-07-19 4:08 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190719040246.15945-1-sashal@kernel.org>
2019-07-19 4:02 ` [PATCH AUTOSEL 5.1 097/141] perf stat: Fix use-after-freed pointer detected by the smatch tool Sasha Levin
2019-07-19 4:02 ` [PATCH AUTOSEL 5.1 098/141] perf top: Fix potential NULL pointer dereference " Sasha Levin
2019-07-19 4:02 ` [PATCH AUTOSEL 5.1 099/141] perf trace: Fix potential NULL pointer dereference found " Sasha Levin
2019-07-19 4:02 ` Sasha Levin [this message]
2019-07-19 4:02 ` [PATCH AUTOSEL 5.1 101/141] perf map: Fix potential NULL pointer dereference found by " Sasha Levin
2019-07-19 4:02 ` [PATCH AUTOSEL 5.1 102/141] perf annotate: Fix dereferencing freed memory found by the " Sasha Levin
2019-07-19 4:02 ` [PATCH AUTOSEL 5.1 103/141] perf hists browser: Fix potential NULL pointer dereference " Sasha Levin
2019-07-19 4:02 ` [PATCH AUTOSEL 5.1 106/141] perf intel-bts: " Sasha Levin
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