[PATCH net v2 1/2] net/tcp: fix TCP-AO key deletion in VRFs

TCP-AO keys with TCP_AO_KEYF_IFINDEX store the VRF L3 interface index in
l3index. tcp_ao_del_cmd() validates the supplied ifindex, but does not
assign it to its local l3index before matching keys.

As a result, deleting a key scoped to a non-default VRF always fails with
ENOENT because it is matched against l3index 0.

Fixes: 248411b8cb89 ("net/tcp: Wire up l3index to TCP-AO")
Cc: stable@vger.kernel.org
Signed-off-by: Rastislav Szabo <redacted>
Reviewed-by: David Ahern <dsahern@kernel.org>
Acked-by: Dmitry Safonov <redacted>
---
Changes in v2:
- Add review tags.

 net/ipv4/tcp_ao.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index 5094267447ae..26864621e6de 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c

@@ -1834,6 +1834,9 @@ static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family,
 	if (cmd.ifindex && !(cmd.keyflags & TCP_AO_KEYF_IFINDEX))
 		return -EINVAL;
 
+	if (cmd.keyflags & TCP_AO_KEYF_IFINDEX)
+		l3index = cmd.ifindex;
+
 	ao_info = setsockopt_ao_info(sk);
 	if (IS_ERR(ao_info))
 		return PTR_ERR(ao_info);

base-commit: 746fc0787f616da418ffc04a110296fe95d53491
-- 
2.43.0