From: Jiri Olsa <jolsa@redhat.com>
To: Andrii Nakryiko <andriin@fb.com>
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org, ast@fb.com,
daniel@iogearbox.net, andrii.nakryiko@gmail.com,
kernel-team@fb.com, Jiri Olsa <jolsa@kernel.org>
Subject: Re: [PATCH bpf-next] selftests/bpf: fix trampoline_count clean up logic
Date: Fri, 21 Feb 2020 14:04:24 +0100 [thread overview]
Message-ID: <20200221130424.GB652992@krava> (raw)
In-Reply-To: <20200220230546.769250-1-andriin@fb.com>
On Thu, Feb 20, 2020 at 03:05:46PM -0800, Andrii Nakryiko wrote:
> Libbpf's Travis CI tests caught this issue. Ensure bpf_link and bpf_object
> clean up is performed correctly.
>
> Fixes: d633d57902a5 ("selftest/bpf: Add test for allowed trampolines count")
> Cc: Jiri Olsa <jolsa@kernel.org>
> Signed-off-by: Andrii Nakryiko <andriin@fb.com>
> ---
> .../bpf/prog_tests/trampoline_count.c | 25 +++++++++++++------
> 1 file changed, 18 insertions(+), 7 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/trampoline_count.c b/tools/testing/selftests/bpf/prog_tests/trampoline_count.c
> index 1f6ccdaed1ac..781c8d11604b 100644
> --- a/tools/testing/selftests/bpf/prog_tests/trampoline_count.c
> +++ b/tools/testing/selftests/bpf/prog_tests/trampoline_count.c
> @@ -55,31 +55,40 @@ void test_trampoline_count(void)
> /* attach 'allowed' 40 trampoline programs */
> for (i = 0; i < MAX_TRAMP_PROGS; i++) {
> obj = bpf_object__open_file(object, NULL);
> - if (CHECK(IS_ERR(obj), "obj_open_file", "err %ld\n", PTR_ERR(obj)))
> + if (CHECK(IS_ERR(obj), "obj_open_file", "err %ld\n", PTR_ERR(obj))) {
> + obj = NULL;
> goto cleanup;
> + }
>
> err = bpf_object__load(obj);
> if (CHECK(err, "obj_load", "err %d\n", err))
> goto cleanup;
> inst[i].obj = obj;
> + obj = NULL;
>
> if (rand() % 2) {
> - link = load(obj, fentry_name);
> - if (CHECK(IS_ERR(link), "attach prog", "err %ld\n", PTR_ERR(link)))
> + link = load(inst[i].obj, fentry_name);
> + if (CHECK(IS_ERR(link), "attach prog", "err %ld\n", PTR_ERR(link))) {
> + link = NULL;
> goto cleanup;
> + }
> inst[i].link_fentry = link;
> } else {
> - link = load(obj, fexit_name);
> - if (CHECK(IS_ERR(link), "attach prog", "err %ld\n", PTR_ERR(link)))
> + link = load(inst[i].obj, fexit_name);
> + if (CHECK(IS_ERR(link), "attach prog", "err %ld\n", PTR_ERR(link))) {
> + link = NULL;
> goto cleanup;
> + }
> inst[i].link_fexit = link;
> }
> }
>
> /* and try 1 extra.. */
> obj = bpf_object__open_file(object, NULL);
> - if (CHECK(IS_ERR(obj), "obj_open_file", "err %ld\n", PTR_ERR(obj)))
> + if (CHECK(IS_ERR(obj), "obj_open_file", "err %ld\n", PTR_ERR(obj))) {
> + obj = NULL;
> goto cleanup;
> + }
>
> err = bpf_object__load(obj);
> if (CHECK(err, "obj_load", "err %d\n", err))
> @@ -104,7 +113,9 @@ void test_trampoline_count(void)
> cleanup_extra:
> bpf_object__close(obj);
> cleanup:
> - while (--i) {
> + if (i >= MAX_TRAMP_PROGS)
> + i = MAX_TRAMP_PROGS - 1;
> + for (; i >= 0; i--) {
ugh right, if we fail in first iteration, 'i' would get get -1 in here
thanks,
jirka
> bpf_link__destroy(inst[i].link_fentry);
> bpf_link__destroy(inst[i].link_fexit);
> bpf_object__close(inst[i].obj);
> --
> 2.17.1
>
prev parent reply other threads:[~2020-02-21 13:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-20 23:05 [PATCH bpf-next] selftests/bpf: fix trampoline_count clean up logic Andrii Nakryiko
2020-02-21 2:04 ` Alexei Starovoitov
2020-02-21 2:06 ` Song Liu
2020-02-21 4:20 ` Andrii Nakryiko
2020-02-21 4:31 ` Song Liu
2020-02-21 4:45 ` Andrii Nakryiko
2020-02-21 10:21 ` Jakub Sitnicki
2020-02-22 0:21 ` Andrii Nakryiko
2020-02-21 13:04 ` Jiri Olsa [this message]
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