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Date: Tue, 25 Jun 2024 16:24:39 +0800 From: Geliang Tang <geliang@...nel.org> To: John Fastabend <john.fastabend@...il.com>, Jakub Sitnicki <jakub@...udflare.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, David Ahern <dsahern@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, Eduard Zingerman <eddyz87@...il.com>, Mykola Lysenko <mykolal@...com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>, Mykyta Yatsenko <yatsenko@...a.com>, Miao Xu <miaxu@...a.com>, Yuran Pereira <yuran.pereira@...mail.com>, Huacai Chen <chenhuacai@...nel.org>, Tiezhu Yang <yangtiezhu@...ngson.cn> Cc: Geliang Tang <tanggeliang@...inos.cn>, netdev@...r.kernel.org, bpf@...r.kernel.org, linux-kselftest@...r.kernel.org Subject: [PATCH bpf-next v2 4/4] selftests/bpf: Null checks for link in bpf_tcp_ca From: Geliang Tang <tanggeliang@...inos.cn> Run BPF selftests bpf_tcp_ca on Loongarch: ./test_progs -t bpf_tcp_ca A "Segmentation fault" error occurs: ''' test_dctcp:PASS:bpf_dctcp__open_and_load 0 nsec test_dctcp:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/1 bpf_tcp_ca/dctcp:FAIL test_cubic:PASS:bpf_cubic__open_and_load 0 nsec test_cubic:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/2 bpf_tcp_ca/cubic:FAIL test_dctcp_fallback:PASS:dctcp_skel 0 nsec test_dctcp_fallback:PASS:bpf_dctcp__load 0 nsec test_dctcp_fallback:FAIL:dctcp link unexpected error: -524 #29/4 bpf_tcp_ca/dctcp_fallback:FAIL test_write_sk_pacing:PASS:open_and_load 0 nsec test_write_sk_pacing:FAIL:attach_struct_ops unexpected error: -524 #29/6 bpf_tcp_ca/write_sk_pacing:FAIL test_update_ca:PASS:open 0 nsec test_update_ca:FAIL:attach_struct_ops unexpected error: -524 settcpca:FAIL:setsockopt unexpected setsockopt: actual -1 == expected -1 (network_helpers.c:99: errno: No such file or directory) Failed to call post_socket_cb start_test:FAIL:start_server_str unexpected start_server_str: actual -1 == expected -1 test_update_ca:FAIL:ca1_ca1_cnt unexpected ca1_ca1_cnt: actual 0 <= expected 0 #29/9 bpf_tcp_ca/update_ca:FAIL #29 bpf_tcp_ca:FAIL Caught signal #11! Stack trace: ./test_progs(crash_handler+0x28)[0x5555567ed91c] linux-vdso.so.1(__vdso_rt_sigreturn+0x0)[0x7ffffee408b0] ./test_progs(bpf_link__update_map+0x80)[0x555556824a78] ./test_progs(+0x94d68)[0x5555564c4d68] ./test_progs(test_bpf_tcp_ca+0xe8)[0x5555564c6a88] ./test_progs(+0x3bde54)[0x5555567ede54] ./test_progs(main+0x61c)[0x5555567efd54] /usr/lib64/libc.so.6(+0x22208)[0x7ffff2aaa208] /usr/lib64/libc.so.6(__libc_start_main+0xac)[0x7ffff2aaa30c] ./test_progs(_start+0x48)[0x55555646bca8] Segmentation fault ''' This is because "link" is NULL in that case. This patch adds null checks for link in bpf_tcp_ca to fix this error. Signed-off-by: Geliang Tang <tanggeliang@...inos.cn> --- .../selftests/bpf/prog_tests/bpf_tcp_ca.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c index bceff5900016..e920ecf0e888 100644 --- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c +++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c @@ -411,7 +411,8 @@ static void test_update_ca(void) return; link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); - ASSERT_OK_PTR(link, "attach_struct_ops"); + if (!ASSERT_OK_PTR(link, "attach_struct_ops")) + goto err; do_test(&opts); saved_ca1_cnt = skel->bss->ca1_cnt; @@ -425,6 +426,7 @@ static void test_update_ca(void) ASSERT_GT(skel->bss->ca2_cnt, 0, "ca2_ca2_cnt"); bpf_link__destroy(link); +err: tcp_ca_update__destroy(skel); } @@ -447,7 +449,8 @@ static void test_update_wrong(void) return; link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); - ASSERT_OK_PTR(link, "attach_struct_ops"); + if (!ASSERT_OK_PTR(link, "attach_struct_ops")) + goto err; do_test(&opts); saved_ca1_cnt = skel->bss->ca1_cnt; @@ -460,6 +463,7 @@ static void test_update_wrong(void) ASSERT_GT(skel->bss->ca1_cnt, saved_ca1_cnt, "ca2_ca1_cnt"); bpf_link__destroy(link); +err: tcp_ca_update__destroy(skel); } @@ -484,7 +488,8 @@ static void test_mixed_links(void) ASSERT_OK_PTR(link_nl, "attach_struct_ops_nl"); link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); - ASSERT_OK_PTR(link, "attach_struct_ops"); + if (!ASSERT_OK_PTR(link, "attach_struct_ops")) + goto err; do_test(&opts); ASSERT_GT(skel->bss->ca1_cnt, 0, "ca1_ca1_cnt"); @@ -493,6 +498,7 @@ static void test_mixed_links(void) ASSERT_ERR(err, "update_map"); bpf_link__destroy(link); +err: bpf_link__destroy(link_nl); tcp_ca_update__destroy(skel); } @@ -536,7 +542,8 @@ static void test_link_replace(void) bpf_link__destroy(link); link = bpf_map__attach_struct_ops(skel->maps.ca_update_2); - ASSERT_OK_PTR(link, "attach_struct_ops_2nd"); + if (!ASSERT_OK_PTR(link, "attach_struct_ops_2nd")) + goto err; /* BPF_F_REPLACE with a wrong old map Fd. It should fail! * @@ -559,6 +566,7 @@ static void test_link_replace(void) bpf_link__destroy(link); +err: tcp_ca_update__destroy(skel); } -- 2.43.0
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