linux-kernel - [PATCH net] ipv4: correctly iterate over the target netns in inet_dump

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Date: Tue, 28 May 2024 22:30:30 +0200
From: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
To: edumazet@...gle.com
Cc: kuba@...nel.org,
	dsahern@...nel.org,
	pabeni@...hat.com,
	stgraber@...raber.org,
	brauner@...nel.org,
	davem@...emloft.net,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
Subject: [PATCH net] ipv4: correctly iterate over the target netns in inet_dump_ifaddr()

A recent change to inet_dump_ifaddr had the function incorrectly iterate
over net rather than tgt_net, resulting in the data coming for the
incorrect network namespace.

Fixes: cdb2f80f1c10 ("inet: use xa_array iterator to implement inet_dump_ifaddr()")
Reported-by: Stéphane Graber <stgraber@...raber.org>
Closes: https://github.com/lxc/incus/issues/892
Bisected-by: Stéphane Graber <stgraber@...raber.org>
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
Tested-by: Stéphane Graber <stgraber@...raber.org>
---
 net/ipv4/devinet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index e827da128c5f..f3892ee9dfb3 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1903,7 +1903,7 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 
 	cb->seq = inet_base_seq(tgt_net);
 
-	for_each_netdev_dump(net, dev, ctx->ifindex) {
+	for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
 		in_dev = __in_dev_get_rcu(dev);
 		if (!in_dev)
 			continue;
-- 
2.34.1