From de1b5ea789dc28066cc8dc634b6825bd6148f38b Mon Sep 17 00:00:00 2001
From: Geliang Tang <tanggeliang@kylinos.cn>
Date: Thu, 23 May 2024 14:50:03 +0800
Subject: 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
---
tools/testing/selftests/bpf/test_sockmap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
(limited to 'tools/testing/selftests/bpf/test_sockmap.c')
diff --git a/tools/testing/selftests/bpf/test_sockmap.c b/tools/testing/selftests/bpf/test_sockmap.c
index e29f8203bd4f..9cba4ec844a5 100644
--- 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;
--
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