perf offcpu: Add missed btf_free

Caught by address/leak sanitizer.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: James Clark <james.clark@arm.com>
Cc: Nick Terrell <terrelln@fb.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: liuwenyu <liuwenyu7@huawei.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Song Liu <song@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Yanteng Si <siyanteng@loongson.cn>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Link: https://lore.kernel.org/r/20231024222353.3024098-8-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

diff --git a/tools/perf/util/bpf_off_cpu.c b/tools/perf/util/bpf_off_cpu.c
index 21f4d9b..6af3614 100644 (file)
--- a/tools/perf/util/bpf_off_cpu.c
+++ b/tools/perf/util/bpf_off_cpu.c
@@ -98,22 +98,22 @@ static void off_cpu_finish(void *arg __maybe_unused)
 /* v5.18 kernel added prev_state arg, so it needs to check the signature */
 static void check_sched_switch_args(void)
 {
-       const struct btf *btf = btf__load_vmlinux_btf();
+       struct btf *btf = btf__load_vmlinux_btf();
        const struct btf_type *t1, *t2, *t3;
        u32 type_id;
 
        type_id = btf__find_by_name_kind(btf, "btf_trace_sched_switch",
                                         BTF_KIND_TYPEDEF);
        if ((s32)type_id < 0)
-               return;
+               goto cleanup;
 
        t1 = btf__type_by_id(btf, type_id);
        if (t1 == NULL)
-               return;
+               goto cleanup;
 
        t2 = btf__type_by_id(btf, t1->type);
        if (t2 == NULL || !btf_is_ptr(t2))
-               return;
+               goto cleanup;
 
        t3 = btf__type_by_id(btf, t2->type);
        /* btf_trace func proto has one more argument for the context */
@@ -121,6 +121,8 @@ static void check_sched_switch_args(void)
                /* new format: pass prev_state as 4th arg */
                skel->rodata->has_prev_state = true;
        }
+cleanup:
+       btf__free(btf);
 }
 
 int off_cpu_prepare(struct evlist *evlist, struct target *target,