perf intel-pt: Fix potential NULL pointer dereference found by the smatch tool

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>

1 files 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 |