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| author | Eric Dumazet <edumazet@google.com> | 2025-02-05 15:51:18 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-21 14:01:42 +0100 |
| commit | 713a40c892f40300d63691d9f85b2a23b48fe1e8 (patch) | |
| tree | 5e4c02bc1aeacc5aa1d6a42820aff77fc9704514 /net | |
| parent | a575827791918418a9565734d941624775c3de28 (diff) | |
| download | linux-713a40c892f40300d63691d9f85b2a23b48fe1e8.tar.gz linux-713a40c892f40300d63691d9f85b2a23b48fe1e8.tar.bz2 linux-713a40c892f40300d63691d9f85b2a23b48fe1e8.zip | |
ipv6: use RCU protection in ip6_default_advmss()
[ Upstream commit 3c8ffcd248da34fc41e52a46e51505900115fc2a ]
ip6_default_advmss() needs rcu protection to make
sure the net structure it reads does not disappear.
Fixes: 5578689a4e3c ("[NETNS][IPV6] route6 - make route6 per namespace")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250205155120.1676781-11-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/route.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 8ebfed5d6323..2736dea77575 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -3196,13 +3196,18 @@ static unsigned int ip6_default_advmss(const struct dst_entry *dst) { struct net_device *dev = dst->dev; unsigned int mtu = dst_mtu(dst); - struct net *net = dev_net(dev); + struct net *net; mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); + rcu_read_lock(); + + net = dev_net_rcu(dev); if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) mtu = net->ipv6.sysctl.ip6_rt_min_advmss; + rcu_read_unlock(); + /* * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. |