netdev - [PATCH bpf] selftests/bpf: fix v4_to_v6 in sk

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Date:   Fri,  7 Aug 2020 15:38:46 -0700
From:   Stanislav Fomichev <sdf@...gle.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        Stanislav Fomichev <sdf@...gle.com>
Subject: [PATCH bpf] selftests/bpf: fix v4_to_v6 in sk_lookup

I'm getting some garbage in bytes 8 and 9 when doing conversion
from sockaddr_in to sockaddr_in6 (leftover from AF_INET?).
Let's explicitly clear the higher bytes.

Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
 tools/testing/selftests/bpf/prog_tests/sk_lookup.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
index c571584c00f5..9ff0412e1fd3 100644
--- a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
+++ b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
@@ -309,6 +309,7 @@ static void v4_to_v6(struct sockaddr_storage *ss)
 	v6->sin6_addr.s6_addr[10] = 0xff;
 	v6->sin6_addr.s6_addr[11] = 0xff;
 	memcpy(&v6->sin6_addr.s6_addr[12], &v4.sin_addr.s_addr, 4);
+	memset(&v6->sin6_addr.s6_addr[0], 0, 10);
 }
 
 static int udp_recv_send(int server_fd)
-- 
2.28.0.236.gb10cc79966-goog