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AJvYcCXNxXpJgbuLbLxoICc+hLTPuZhKtEU0PtSAwiXNECajyaCsxSIDU67TAZAS5kHm5J5oYWZL+xNK5nF2Vic=@vger.kernel.org X-Gm-Message-State: AOJu0Yx6xwJ89SUO9iIzKQrWHQUUcsYmXJE5mqfmaw3OxgLLodm7ixxJ vhaINcbgh2Et4epIW1NvDtAsZeq3M3IJI5bxaxjZ8g7MFkWPzWBCe+EVWU39TgD96yNw7oidbjd B/bc3y+9KMw== X-Received: from pjuf2.prod.google.com ([2002:a17:90a:ce02:b0:35b:9e0a:de3f]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:1a8a:b0:35b:9ab6:1d59 with SMTP id 98e67ed59e1d1-35bd27f16abmr650514a91.13.1773962644102; Thu, 19 Mar 2026 16:24:04 -0700 (PDT) Date: Thu, 19 Mar 2026 16:23:11 -0700 In-Reply-To: <20260319232334.287517-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260209174032.4142096-1-irogers@google.com> <20260319232334.287517-1-irogers@google.com> X-Mailer: git-send-email 2.53.0.959.g497ff81fa9-goog Message-ID: <20260319232334.287517-3-irogers@google.com> Subject: [PATCH v2 02/25] perf sample: Make sure perf_sample__init/exit are used From: Ian Rogers To: acme@kernel.org, namhyung@kernel.org Cc: irogers@google.com, adrian.hunter@intel.com, ajones@ventanamicro.com, ak@linux.intel.com, alex@ghiti.fr, alexander.shishkin@linux.intel.com, anup@brainfault.org, aou@eecs.berkeley.edu, atrajeev@linux.ibm.com, blakejones@google.com, ctshao@google.com, dapeng1.mi@linux.intel.com, derek.foreman@collabora.com, dvyukov@google.com, howardchu95@gmail.com, hrishikesh123s@gmail.com, james.clark@linaro.org, jolsa@kernel.org, krzysztof.m.lopatowski@gmail.com, leo.yan@arm.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux@treblig.org, mingo@redhat.com, nichen@iscas.ac.cn, palmer@dabbelt.com, peterz@infradead.org, pjw@kernel.org, ravi.bangoria@amd.com, swapnil.sapkal@amd.com, tanze@kylinos.cn, thomas.falcon@intel.com, tianyou.li@intel.com, yujie.liu@intel.com, zhouquan@iscas.ac.cn Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The deferred stack trace code wasn't using perf_sample__init/exit. Add the deferred stack trace clean up to perf_sample__exit which requires proper NULL initialization in perf_sample__init. Make the perf_sample__exit robust to being called more than once by using zfree. Make the error paths in evsel__parse_sample exit the sample. Signed-off-by: Ian Rogers --- tools/perf/builtin-inject.c | 5 ++++- tools/perf/util/evlist.c | 5 ++++- tools/perf/util/evsel.c | 28 +++++++++++++++++----------- tools/perf/util/sample.c | 10 ++++++++-- tools/perf/util/session.c | 13 +++++++++---- 5 files changed, 42 insertions(+), 19 deletions(-) diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c index 5b29f4296861..039323908ebf 100644 --- a/tools/perf/builtin-inject.c +++ b/tools/perf/builtin-inject.c @@ -1087,6 +1087,7 @@ static int perf_inject__sched_stat(const struct perf_= tool *tool, struct perf_sample sample_sw; struct perf_inject *inject =3D container_of(tool, struct perf_inject, too= l); u32 pid =3D evsel__intval(evsel, sample, "pid"); + int ret; =20 list_for_each_entry(ent, &inject->samples, node) { if (pid =3D=3D ent->tid) @@ -1103,7 +1104,9 @@ static int perf_inject__sched_stat(const struct perf_= tool *tool, perf_event__synthesize_sample(event_sw, evsel->core.attr.sample_type, evsel->core.attr.read_format, &sample_sw); build_id__mark_dso_hit(tool, event_sw, &sample_sw, evsel, machine); - return perf_event__repipe(tool, event_sw, &sample_sw, machine); + ret =3D perf_event__repipe(tool, event_sw, &sample_sw, machine); + perf_sample__exit(&sample_sw); + return ret; } #endif =20 diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 591bdf0b3e2a..bdb196425071 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1622,8 +1622,11 @@ int evlist__parse_sample(struct evlist *evlist, unio= n perf_event *event, struct struct evsel *evsel =3D evlist__event2evsel(evlist, event); int ret; =20 - if (!evsel) + if (!evsel) { + /* Ensure the sample is okay for perf_sample__exit. */ + perf_sample__init(sample, /*all=3D*/false); return -EFAULT; + } ret =3D evsel__parse_sample(evsel, event, sample); if (ret) return ret; diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index f59228c1a39e..34ae388750db 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -3067,7 +3067,7 @@ static inline bool overflow(const void *endp, u16 max= _size, const void *offset, #define OVERFLOW_CHECK(offset, size, max_size) \ do { \ if (overflow(endp, (max_size), (offset), (size))) \ - return -EFAULT; \ + goto out_efault; \ } while (0) =20 #define OVERFLOW_CHECK_u64(offset) \ @@ -3199,6 +3199,8 @@ static int __set_offcpu_sample(struct perf_sample *da= ta) data->cgroup =3D *array; =20 return 0; +out_efault: + return -EFAULT; } =20 int evsel__parse_sample(struct evsel *evsel, union perf_event *event, @@ -3217,7 +3219,7 @@ int evsel__parse_sample(struct evsel *evsel, union pe= rf_event *event, */ union u64_swap u; =20 - memset(data, 0, sizeof(*data)); + perf_sample__init(data, /*all=3D*/true); data->cpu =3D data->pid =3D data->tid =3D -1; data->stream_id =3D data->id =3D data->time =3D -1ULL; data->period =3D evsel->core.attr.sample_period; @@ -3231,25 +3233,26 @@ int evsel__parse_sample(struct evsel *evsel, union = perf_event *event, =20 data->callchain =3D (struct ip_callchain *)&event->callchain_deferred.nr; if (data->callchain->nr > max_callchain_nr) - return -EFAULT; + goto out_efault; =20 data->deferred_cookie =3D event->callchain_deferred.cookie; =20 if (evsel->core.attr.sample_id_all) perf_evsel__parse_id_sample(evsel, event, data); + return 0; } =20 if (event->header.type !=3D PERF_RECORD_SAMPLE) { - if (!evsel->core.attr.sample_id_all) - return 0; - return perf_evsel__parse_id_sample(evsel, event, data); + if (evsel->core.attr.sample_id_all) + perf_evsel__parse_id_sample(evsel, event, data); + return 0; } =20 array =3D event->sample.array; =20 if (perf_event__check_size(event, evsel->sample_size)) - return -EFAULT; + goto out_efault; =20 if (type & PERF_SAMPLE_IDENTIFIER) { data->id =3D *array; @@ -3342,7 +3345,7 @@ int evsel__parse_sample(struct evsel *evsel, union pe= rf_event *event, sizeof(struct sample_read_value); =20 if (data->read.group.nr > max_group_nr) - return -EFAULT; + goto out_efault; =20 sz =3D data->read.group.nr * sample_read_value_size(read_format); OVERFLOW_CHECK(array, sz, max_size); @@ -3370,7 +3373,7 @@ int evsel__parse_sample(struct evsel *evsel, union pe= rf_event *event, data->callchain =3D (struct ip_callchain *)array++; callchain_nr =3D data->callchain->nr; if (callchain_nr > max_callchain_nr) - return -EFAULT; + goto out_efault; sz =3D callchain_nr * sizeof(u64); /* * Save the cookie for the deferred user callchain. The last 2 @@ -3428,7 +3431,7 @@ int evsel__parse_sample(struct evsel *evsel, union pe= rf_event *event, data->branch_stack =3D (struct branch_stack *)array++; =20 if (data->branch_stack->nr > max_branch_nr) - return -EFAULT; + goto out_efault; =20 sz =3D data->branch_stack->nr * sizeof(struct branch_entry); if (evsel__has_branch_hw_idx(evsel)) { @@ -3505,7 +3508,7 @@ int evsel__parse_sample(struct evsel *evsel, union pe= rf_event *event, data->user_stack.size =3D *array++; if (WARN_ONCE(data->user_stack.size > sz, "user stack dump failure\n")) - return -EFAULT; + goto out_efault; } } =20 @@ -3586,6 +3589,9 @@ int evsel__parse_sample(struct evsel *evsel, union pe= rf_event *event, return __set_offcpu_sample(data); =20 return 0; +out_efault: + perf_sample__exit(data); + return -EFAULT; } =20 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *e= vent, diff --git a/tools/perf/util/sample.c b/tools/perf/util/sample.c index 8f82aaf1aab6..b04cbad7edd3 100644 --- a/tools/perf/util/sample.c +++ b/tools/perf/util/sample.c @@ -21,13 +21,19 @@ void perf_sample__init(struct perf_sample *sample, bool= all) } else { sample->user_regs =3D NULL; sample->intr_regs =3D NULL; + sample->deferred_callchain =3D false; + sample->callchain =3D NULL; } } =20 void perf_sample__exit(struct perf_sample *sample) { - free(sample->user_regs); - free(sample->intr_regs); + zfree(&sample->user_regs); + zfree(&sample->intr_regs); + if (sample->deferred_callchain) { + zfree(&sample->callchain); + sample->deferred_callchain =3D false; + } } =20 struct regs_dump *perf_sample__user_regs(struct perf_sample *sample) diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 4b465abfa36c..c48e840da7d4 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -1367,14 +1367,18 @@ static int evlist__deliver_deferred_callchain(struc= t evlist *evlist, list_for_each_entry_safe(de, tmp, &evlist->deferred_samples, list) { struct perf_sample orig_sample; =20 + perf_sample__init(&orig_sample, /*all=3D*/false); ret =3D evlist__parse_sample(evlist, de->event, &orig_sample); if (ret < 0) { pr_err("failed to parse original sample\n"); + perf_sample__exit(&orig_sample); break; } =20 - if (sample->tid !=3D orig_sample.tid) + if (sample->tid !=3D orig_sample.tid) { + perf_sample__exit(&orig_sample); continue; + } =20 if (event->callchain_deferred.cookie =3D=3D orig_sample.deferred_cookie) sample__merge_deferred_callchain(&orig_sample, sample); @@ -1385,9 +1389,7 @@ static int evlist__deliver_deferred_callchain(struct = evlist *evlist, ret =3D evlist__deliver_sample(evlist, tool, de->event, &orig_sample, evsel, machine); =20 - if (orig_sample.deferred_callchain) - free(orig_sample.callchain); - + perf_sample__exit(&orig_sample); list_del(&de->list); free(de->event); free(de); @@ -1414,9 +1416,11 @@ static int session__flush_deferred_samples(struct pe= rf_session *session, list_for_each_entry_safe(de, tmp, &evlist->deferred_samples, list) { struct perf_sample sample; =20 + perf_sample__init(&sample, /*all=3D*/false); ret =3D evlist__parse_sample(evlist, de->event, &sample); if (ret < 0) { pr_err("failed to parse original sample\n"); + perf_sample__exit(&sample); break; } =20 @@ -1424,6 +1428,7 @@ static int session__flush_deferred_samples(struct per= f_session *session, ret =3D evlist__deliver_sample(evlist, tool, de->event, &sample, evsel, machine); =20 + perf_sample__exit(&sample); list_del(&de->list); free(de->event); free(de); --=20 2.53.0.959.g497ff81fa9-goog