selftests/bpf: Check length of recv in test_sockmap

The value of recv in msg_loop may be negative, like EWOULDBLOCK, so it's
necessary to check if it is positive before accumulating it to bytes_recvd.

Fixes: 16962b2404ac ("bpf: sockmap, add selftests")
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/5172563f7c7b2a2e953cef02e89fc34664a7b190.1716446893.git.tanggeliang@kylinos.cn

diff --git a/tools/testing/selftests/bpf/test_sockmap.c b/tools/testing/selftests/bpf/test_sockmap.c
index e29f8203bd4f1c2b521371371e6a704af113ed42..9cba4ec844a53712eb7cb007379faabe139521cb 100644 (file)
--- a/tools/testing/selftests/bpf/test_sockmap.c
+++ b/tools/testing/selftests/bpf/test_sockmap.c
@@ -681,7 +681,8 @@ static int msg_loop(int fd, int iov_count, int iov_length, int cnt,
                                }
                        }
 
-                       s->bytes_recvd += recv;
+                       if (recv > 0)
+                               s->bytes_recvd += recv;
 
                        if (opt->check_recved_len && s->bytes_recvd > total_bytes) {
                                errno = EMSGSIZE;