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Date: Fri, 10 Nov 2017 22:19:51 -0800
From: Lawrence Brakmo <brakmo@...com>
To: netdev <netdev@...r.kernel.org>
CC: Alexei Starovoitov <ast@...com>,
Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH net-next v2 2/6] bpf: Fix tcp_rwnd_kern.c sample program
The program was returning -1 in some cases which is not allowed
by the verifier any longer.
Fixes: 390ee7e29fc8 ("bpf: enforce return code for cgroup-bpf programs")
Signed-off-by: Lawrence Brakmo <brakmo@...com>
---
samples/bpf/tcp_rwnd_kern.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/samples/bpf/tcp_rwnd_kern.c b/samples/bpf/tcp_rwnd_kern.c
index 3f2a228..09ff65b 100644
--- a/samples/bpf/tcp_rwnd_kern.c
+++ b/samples/bpf/tcp_rwnd_kern.c
@@ -38,8 +38,10 @@ int bpf_rwnd(struct bpf_sock_ops *skops)
* if neither port numberis 55601
*/
if (bpf_ntohl(skops->remote_port) !=
- 55601 && skops->local_port != 55601)
- return -1;
+ 55601 && skops->local_port != 55601) {
+ skops->reply = -1;
+ return 1;
+ }
op = (int) skops->op;
--
2.9.5
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