linux-kernel - [PATCH net v5 08/10] ip6mr: Lock RCU before ip6mr_get_table() call in ip6_mroute

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Message-ID: <20241014151247.1902637-9-stefan.wiehler@nokia.com>
Date: Mon, 14 Oct 2024 17:05:54 +0200
From: Stefan Wiehler <stefan.wiehler@...ia.com>
To: "David S . Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Stefan Wiehler <stefan.wiehler@...ia.com>
Subject: [PATCH net v5 08/10] ip6mr: Lock RCU before ip6mr_get_table() call in ip6_mroute_getsockopt()

When IPV6_MROUTE_MULTIPLE_TABLES is enabled, calls to ip6mr_get_table()
must be done under RCU or RTNL lock.

Fixes: d1db275dd3f6 ("ipv6: ip6mr: support multiple tables")
Signed-off-by: Stefan Wiehler <stefan.wiehler@...ia.com>
---
 net/ipv6/ip6mr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index b54353bee2f8..af921e9731ec 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1845,7 +1845,9 @@ int ip6_mroute_getsockopt(struct sock *sk, int optname, sockptr_t optval,
 	    inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
 		return -EOPNOTSUPP;
 
+	rcu_read_lock();
 	mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+	rcu_read_unlock();
 	if (!mrt)
 		return -ENOENT;
 
-- 
2.42.0