[PATCH 4.14 41/71] bpf: bpf_setsockopt: reset sock dst on SO_MARK changes

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit f4924f24da8c7ef64195096817f3cde324091d97 ]

In sock_setsockopt() (net/core/sock.h), when SO_MARK option is used
to change sk_mark, sk_dst_reset(sk) is called. The same should be
done in bpf_setsockopt().

Fixes: 8c4b4c7e9ff0 ("bpf: Add setsockopt helper function to bpf")
Reported-by: Maciej Żenczykowski <m...@google.com>
Signed-off-by: Peter Oskolkov <p...@google.com>
Acked-by: Martin KaFai Lau <ka...@fb.com>
Reviewed-by: Maciej Żenczykowski <m...@google.com>
Signed-off-by: Daniel Borkmann <dan...@iogearbox.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 net/core/filter.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index a8a9ff0568b91..41ede90fc28f5 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3102,7 +3102,10 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, 
bpf_sock,
                        sk->sk_rcvlowat = val ? : 1;
                        break;
                case SO_MARK:
-                       sk->sk_mark = val;
+                       if (sk->sk_mark != val) {
+                               sk->sk_mark = val;
+                               sk_dst_reset(sk);
+                       }
                        break;
                default:
                        ret = -EINVAL;
-- 
2.19.1