From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: Leo Yan <leo.yan@linaro.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Andi Kleen <ak@linux.intel.com>,
"David S. Miller" <davem@davemloft.net>,
Davidlohr Bueso <dave@stgolabs.net>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Jin Yao <yao.jin@linux.intel.com>,
Song Liu <songliubraving@fb.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Alexios Zavras <alexios.zavras@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Changbin Du <changbin.du@intel.com>,
Eric Saint-Etienne <eric.saint.etienne@oracle.com>,
Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
Thomas Richter <tmricht@linux.ibm.com>,
Alexey Budankov <alexey.budankov@linux.intel.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v1 11/11] perf cs-etm: Smatch: Fix potential NULL pointer dereference
Date: Tue, 2 Jul 2019 11:03:06 -0600 [thread overview]
Message-ID: <20190702170306.GA17808@xps15> (raw)
In-Reply-To: <20190702103420.27540-12-leo.yan@linaro.org>
Hi Leo,
On Tue, Jul 02, 2019 at 06:34:20PM +0800, Leo Yan wrote:
> Based on the following report from Smatch, fix the potential
> NULL pointer dereference check.
>
> tools/perf/util/cs-etm.c:2545
> cs_etm__process_auxtrace_info() error: we previously assumed
> 'session->itrace_synth_opts' could be null (see line 2541)
>
> tools/perf/util/cs-etm.c
> 2541 if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
> 2542 etm->synth_opts = *session->itrace_synth_opts;
> 2543 } else {
> 2544 itrace_synth_opts__set_default(&etm->synth_opts,
> 2545 session->itrace_synth_opts->default_no_sample);
> ^^^^^^^^^^^^^^^^^^^^^^^^^^
> 2546 etm->synth_opts.callchain = false;
> 2547 }
>
> To dismiss the potential NULL pointer dereference, this patch validates
> the pointer 'session->itrace_synth_opts' before access its elements.
>
> Signed-off-by: Leo Yan <leo.yan@linaro.org>
> ---
> tools/perf/util/cs-etm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
> index 0c7776b51045..b79df56eb9df 100644
> --- a/tools/perf/util/cs-etm.c
> +++ b/tools/perf/util/cs-etm.c
> @@ -2540,7 +2540,7 @@ int cs_etm__process_auxtrace_info(union perf_event *event,
>
> if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
> etm->synth_opts = *session->itrace_synth_opts;
> - } else {
> + } else if (session->itrace_synth_opts) {
This will work but we end up checking session->itrace_synth_opts twice. I
suggest to check it once and then process with the if/else if valid:
if (session->itrace_synth_opts) {
if (session->itrace_synth_opts->set) {
...
} else {
...
}
}
Thanks,
Mathieu
> itrace_synth_opts__set_default(&etm->synth_opts,
> session->itrace_synth_opts->default_no_sample);
> etm->synth_opts.callchain = false;
> --
> 2.17.1
>
next prev parent reply other threads:[~2019-07-02 17:03 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-02 10:34 [PATCH v1 00/11] perf: Fix errors detected by Smatch Leo Yan
2019-07-02 10:34 ` [PATCH v1 01/11] perf report: Smatch: Fix potential NULL pointer dereference Leo Yan
2019-07-02 10:34 ` [PATCH v1 02/11] perf stat: Smatch: Fix use-after-freed pointer Leo Yan
2019-07-03 18:18 ` Arnaldo Carvalho de Melo
2019-07-13 10:53 ` [tip:perf/urgent] perf stat: Fix use-after-freed pointer detected by the smatch tool tip-bot for Leo Yan
2019-07-02 10:34 ` [PATCH v1 03/11] perf top: Smatch: Fix potential NULL pointer dereference Leo Yan
2019-07-03 18:30 ` Arnaldo Carvalho de Melo
2019-07-13 10:53 ` [tip:perf/urgent] perf top: Fix potential NULL pointer dereference detected by the smatch tool tip-bot for Leo Yan
2019-07-02 10:34 ` [PATCH v1 04/11] perf annotate: Smatch: Fix dereferencing freed memory Leo Yan
2019-07-03 18:43 ` Arnaldo Carvalho de Melo
2019-07-13 10:54 ` [tip:perf/urgent] perf annotate: Fix dereferencing freed memory found by the smatch tool tip-bot for Leo Yan
2019-07-02 10:34 ` [PATCH v1 05/11] perf trace: Smatch: Fix potential NULL pointer dereference Leo Yan
2019-07-03 18:46 ` Arnaldo Carvalho de Melo
2019-07-13 10:55 ` [tip:perf/urgent] perf trace: Fix potential NULL pointer dereference found by the smatch tool tip-bot for Leo Yan
2019-07-02 10:34 ` [PATCH v1 06/11] perf hists: Smatch: Fix potential NULL pointer dereference Leo Yan
2019-07-02 11:07 ` Jiri Olsa
2019-07-02 10:34 ` [PATCH v1 07/11] perf map: " Leo Yan
2019-07-13 10:55 ` [tip:perf/urgent] perf map: Fix potential NULL pointer dereference found by smatch tool tip-bot for Leo Yan
2019-07-02 10:34 ` [PATCH v1 08/11] perf session: Smatch: Fix potential NULL pointer dereference Leo Yan
2019-07-03 19:01 ` Arnaldo Carvalho de Melo
2019-07-13 10:57 ` [tip:perf/urgent] perf session: Fix potential NULL pointer dereference found by the smatch tool tip-bot for Leo Yan
2019-07-02 10:34 ` [PATCH v1 09/11] perf intel-bts: Smatch: Fix potential NULL pointer dereference Leo Yan
2019-07-02 10:34 ` [PATCH v1 10/11] perf intel-pt: " Leo Yan
2019-07-02 11:07 ` Adrian Hunter
2019-07-03 1:35 ` Leo Yan
2019-07-03 5:19 ` Adrian Hunter
2019-07-03 8:16 ` Leo Yan
2019-07-03 10:00 ` Daniel Thompson
2019-07-03 10:28 ` Leo Yan
2019-07-02 10:34 ` [PATCH v1 11/11] perf cs-etm: " Leo Yan
2019-07-02 17:03 ` Mathieu Poirier [this message]
2019-07-03 8:22 ` Leo Yan
2019-07-02 11:07 ` [PATCH v1 00/11] perf: Fix errors detected by Smatch Jiri Olsa
2019-07-03 1:48 ` Leo Yan
2019-07-03 18:18 ` Arnaldo Carvalho de Melo
2019-07-04 7:29 ` Leo Yan
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