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[ Upstream commitde1b5ea789] 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:16962b2404("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 Signed-off-by: Sasha Levin <sashal@kernel.org>