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selftests/bpf: Fix fd cleanup in sk_lookup test

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Similar to the fix in commit:
e31eec77e4 ("bpf: selftests: Fix fd cleanup in get_branch_snapshot")

We use designated initializer to set fds to -1 without breaking on
future changes to MAX_SERVER constant denoting the array size.

The particular close(0) occurs on non-reuseport tests, so it can be seen
with -n 115/{2,3} but not 115/4. This can cause problems with future
tests if they depend on BTF fd never being acquired as fd 0, breaking
internal libbpf assumptions.

Fixes: 0ab5539f85 ("selftests/bpf: Tests for BPF_SK_LOOKUP attach point")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20211028063501.2239335-8-memxor@gmail.com
This commit is contained in:
Kumar Kartikeya Dwivedi 2021-10-28 12:05:00 +05:30 committed by Alexei Starovoitov
parent 087cba799c
commit c3fc706e94
1 changed files with 2 additions and 2 deletions
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4
tools/testing/selftests/bpf/prog_tests/sk_lookup.c
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@ -598,7 +598,7 @@ close:
static void run_lookup_prog(const struct test *t)
{
int server_fds[MAX_SERVERS] = { -1 };
int server_fds[] = { [0 ... MAX_SERVERS - 1] = -1 };
int client_fd, reuse_conn_fd = -1;
struct bpf_link *lookup_link;
int i, err;
@ -1053,7 +1053,7 @@ static void run_sk_assign(struct test_sk_lookup *skel,
struct bpf_program *lookup_prog,
const char *remote_ip, const char *local_ip)
{
int server_fds[MAX_SERVERS] = { -1 };
int server_fds[] = { [0 ... MAX_SERVERS - 1] = -1 };
struct bpf_sk_lookup ctx;
__u64 server_cookie;
int i, err;