[PATCH net] netfilter: ctnetlink: use nf_ct_exp_net() in expectation dump

[Pratham Gupta <pratham36gupta@gmail.com>]

Commit 02a3231b6d82 ("netfilter: nf_conntrack_expect: store netns and zone in expectation")
introduced exp->net so RCU-only expectation paths no longer need to
dereference exp->master for netns lookups.

Commit 3db5647984de ("netfilter: nf_conntrack_expect: skip expectations in other netns via proc")
updated the proc path accordingly, but ctnetlink_exp_dump_table() still
compares against nf_ct_net(exp->master).

Use nf_ct_exp_net(exp) here as well so the netlink dump path matches
the rest of the March 2026 expectation netns/RCU cleanup.

Fixes: 02a3231b6d82 ("netfilter: nf_conntrack_expect: store netns and zone in expectation")
Cc: stable@vger.kernel.org
Signed-off-by: Pratham Gupta <pratham36gupta@gmail.com>
---
Tested expectation create/dump/delete on the host and in fresh Ubuntu 24.04
Docker userspace. Concurrent namespace churn/dump testing did not reproduce
a cross-netns leak.
 net/netfilter/nf_conntrack_netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index eda5fe4a75c8..8ae3f6acc2d2 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -3158,7 +3158,7 @@ ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 			if (l3proto && exp->tuple.src.l3num != l3proto)
 				continue;
 
-			if (!net_eq(nf_ct_net(exp->master), net))
+			if (!net_eq(nf_ct_exp_net(exp), net))
 				continue;
 
 			if (cb->args[1]) {
-- 
2.43.0