perf bpf: Add missing free to bpf_event__print_bpf_prog_info()

stable inclusion
from stable-5.10.80
commit b833274ae6d97294db0fcb55751c6f5b9af151df
bugzilla: 185821 https://gitee.com/openeuler/kernel/issues/I4L7CG

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b833274ae6d97294db0fcb55751c6f5b9af151df

--------------------------------

[ Upstream commit 88c42f4d ]

If btf__new() is called then there needs to be a corresponding btf__free().

Fixes: f8dfeae0 ("perf bpf: Show more BPF program info in print_bpf_prog_info()")
Signed-off-by: NIan Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Yonghong Song <yhs@fb.com>
Cc: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org
Link: http://lore.kernel.org/lkml/20211106053733.3580931-2-irogers@google.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

tools/perf/util/bpf-event.c

@@ -557,7 +557,7 @@ void bpf_event__print_bpf_prog_info(struct bpf_prog_info *info,
 		synthesize_bpf_prog_name(name, KSYM_NAME_LEN, info, btf, 0);
 		fprintf(fp, "# bpf_prog_info %u: %s addr 0x%llx size %u\n",
 			info->id, name, prog_addrs[0], prog_lens[0]);
-		return;
+		goto out;
 	}
 
 	fprintf(fp, "# bpf_prog_info %u:\n", info->id);
@@ -567,4 +567,6 @@ void bpf_event__print_bpf_prog_info(struct bpf_prog_info *info,
 		fprintf(fp, "# \tsub_prog %u: %s addr 0x%llx size %u\n",
 			i, name, prog_addrs[i], prog_lens[i]);
 	}
+out:
+	btf__free(btf);
 }