From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>
Cc: Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Leo Yan <leo.yan@linaro.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Andi Kleen <ak@linux.intel.com>, Jiri Olsa <jolsa@redhat.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki Poulouse <suzuki.poulose@arm.com>,
linux-arm-kernel@lists.infradead.org,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 25/25] perf intel-pt: Fix potential NULL pointer dereference found by the smatch tool
Date: Tue, 9 Jul 2019 15:31:26 -0300 [thread overview]
Message-ID: <20190709183126.30257-26-acme@kernel.org> (raw)
In-Reply-To: <20190709183126.30257-1-acme@kernel.org>
From: Leo Yan <leo.yan@linaro.org>
Based on the following report from Smatch, fix the potential NULL
pointer dereference check.
tools/perf/util/intel-pt.c:3200
intel_pt_process_auxtrace_info() error: we previously assumed
'session->itrace_synth_opts' could be null (see line 3196)
tools/perf/util/intel-pt.c:3206
intel_pt_process_auxtrace_info() warn: variable dereferenced before
check 'session->itrace_synth_opts' (see line 3200)
tools/perf/util/intel-pt.c
3196 if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
3197 pt->synth_opts = *session->itrace_synth_opts;
3198 } else {
3199 itrace_synth_opts__set_default(&pt->synth_opts,
3200 session->itrace_synth_opts->default_no_sample);
^^^^^^^^^^^^^^^^^^^^^^^^^^
3201 if (!session->itrace_synth_opts->default_no_sample &&
3202 !session->itrace_synth_opts->inject) {
3203 pt->synth_opts.branches = false;
3204 pt->synth_opts.callchain = true;
3205 }
3206 if (session->itrace_synth_opts)
^^^^^^^^^^^^^^^^^^^^^^^^^^
3207 pt->synth_opts.thread_stack =
3208 session->itrace_synth_opts->thread_stack;
3209 }
'session->itrace_synth_opts' is impossible to be a NULL pointer in
intel_pt_process_auxtrace_info(), thus this patch removes the NULL test
for 'session->itrace_synth_opts'.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20190708143937.7722-4-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/intel-pt.c | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index c76a96f777fb..df061599fef4 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -3210,7 +3210,7 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
goto err_delete_thread;
}
- if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
+ if (session->itrace_synth_opts->set) {
pt->synth_opts = *session->itrace_synth_opts;
} else {
itrace_synth_opts__set_default(&pt->synth_opts,
@@ -3220,8 +3220,7 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
pt->synth_opts.branches = false;
pt->synth_opts.callchain = true;
}
- if (session->itrace_synth_opts)
- pt->synth_opts.thread_stack =
+ pt->synth_opts.thread_stack =
session->itrace_synth_opts->thread_stack;
}
@@ -3241,11 +3240,9 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
pt->cbr2khz = tsc_freq / pt->max_non_turbo_ratio / 1000;
}
- if (session->itrace_synth_opts) {
- err = intel_pt_setup_time_ranges(pt, session->itrace_synth_opts);
- if (err)
- goto err_delete_thread;
- }
+ err = intel_pt_setup_time_ranges(pt, session->itrace_synth_opts);
+ if (err)
+ goto err_delete_thread;
if (pt->synth_opts.calls)
pt->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
--
2.21.0
next prev parent reply other threads:[~2019-07-09 18:33 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-09 18:31 [GIT PULL] perf/core improvements and fixes Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 01/25] perf test mmap-thread-lookup: Initialize variable to suppress memory sanitizer warning Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 02/25] perf stat: Fix use-after-freed pointer detected by the smatch tool Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 03/25] perf top: Fix potential NULL pointer dereference " Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 04/25] perf annotate: Fix dereferencing freed memory found " Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 05/25] perf trace: Fix potential NULL pointer dereference " Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 06/25] perf map: Fix potential NULL pointer dereference found by " Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 07/25] perf inject: The tool->read() call may pass a NULL evsel, handle it Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 08/25] perf session: Fix potential NULL pointer dereference found by the smatch tool Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 09/25] perf evsel: perf_evsel__name(NULL) is valid, no need to check evsel Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 10/25] perf tools: Add missing headers, mostly stdlib.h Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 11/25] perf namespaces: Move the conditional setns() prototype to namespaces.h Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 12/25] perf tools: Move get_current_dir_name() cond prototype out of util.h Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 13/25] tools lib: Adopt zalloc()/zfree() from tools/perf Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 14/25] perf tools: Use zfree() where applicable Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 15/25] perf tools: Use list_del_init() more thorougly Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 16/25] perf metricgroup: Add missing list_del_init() when flushing egroups list Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 17/25] perf parse-events: Remove unused variable 'i' Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 18/25] perf parse-events: Remove unused variable: error Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 19/25] perf cs-etm: Fix potential NULL pointer dereference found by the smatch tool Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 20/25] perf hists browser: " Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 21/25] perf scripts python: export-to-postgresql.py: Fix DROP VIEW power_events_view Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 22/25] perf scripts python: export-to-sqlite.py: " Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 23/25] perf script: Assume native_arch for pipe mode Arnaldo Carvalho de Melo
2019-07-09 18:31 ` [PATCH 24/25] perf intel-bts: Fix potential NULL pointer dereference found by the smatch tool Arnaldo Carvalho de Melo
2019-07-09 18:31 ` Arnaldo Carvalho de Melo [this message]
2019-07-13 9:13 ` [GIT PULL] perf/core improvements and fixes Ingo Molnar
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