netdev - [bpf-next] bpf: fix error check in bpf_tcp_gen

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Message-Id: <20190827234622.76209-1-ppenkov.kernel@gmail.com>
Date:   Tue, 27 Aug 2019 16:46:22 -0700
From:   Petar Penkov <ppenkov.kernel@...il.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        Petar Penkov <ppenkov@...gle.com>,
        Stanislav Fomichev <sdf@...gle.com>
Subject: [bpf-next] bpf: fix error check in bpf_tcp_gen_syncookie

From: Petar Penkov <ppenkov@...gle.com>

If a SYN cookie is not issued by tcp_v#_gen_syncookie, then the return
value will be exactly 0, rather than <= 0. Let's change the check to
reflect that, especially since mss is an unsigned value and cannot be
negative.

Fixes: 70d66244317e ("bpf: add bpf_tcp_gen_syncookie helper")
Reported-by: Stanislav Fomichev <sdf@...gle.com>
Signed-off-by: Petar Penkov <ppenkov@...gle.com>
---
 net/core/filter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 0c1059cdad3d..17bc9af8f156 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5903,7 +5903,7 @@ BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len,
 	default:
 		return -EPROTONOSUPPORT;
 	}
-	if (mss <= 0)
+	if (mss == 0)
 		return -ENOENT;
 
 	return cookie | ((u64)mss << 32);
-- 
2.23.0.187.g17f5b7556c-goog