From: Lawrence Brakmo <brakmo@fb.com>
Date: Fri, 10 Nov 2017 22:19:51 -0800
Subject: bpf: Fix tcp_rwnd_kern.c sample program
Patch-mainline: v4.15-rc1
Git-commit: 016e661bb0610a98b1c9ac1250e3269236fabe19
References: bsc#1109837
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@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
samples/bpf/tcp_rwnd_kern.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- 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;