[PATCH AUTOSEL 4.14 04/36] bpf: sock recvbuff must be limited by rmem_max in bpf_setsockopt()

[Sasha Levin]

From: Yafang Shao <laoar.shao@xxxxxxxxx>

[ Upstream commit c9e4576743eeda8d24dedc164d65b78877f9a98c ]

When sock recvbuff is set by bpf_setsockopt(), the value must by
limited by rmem_max. It is the same with sendbuff.

Fixes: 8c4b4c7e9ff0 ("bpf: Add setsockopt helper function to bpf")
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
Acked-by: Martin KaFai Lau <kafai@xxxxxx>
Acked-by: Lawrence Brakmo <brakmo@xxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/core/filter.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index 41ede90fc28f5..61396648381e5 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3081,10 +3081,12 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
 		/* Only some socketops are supported */
 		switch (optname) {
 		case SO_RCVBUF:
+			val = min_t(u32, val, sysctl_rmem_max);
 			sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
 			sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
 			break;
 		case SO_SNDBUF:
+			val = min_t(u32, val, sysctl_wmem_max);
 			sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
 			sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
 			break;
-- 
2.19.1