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ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()

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ipv4_sysctl_exit_net() is currently freeing net->ipv4.sysctl_local_reserved_ports
too soon.

Only after unregister_net_sysctl_table() we can be sure no threads can possibly
use the sysctls, including /proc/sys/net/ipv4/ip_local_reserved_ports.

Fixes: 122ff243f5 ("ipv4: make ip_local_reserved_ports per netns")
Reported-by: Ji'an Zhou <eilaimemedsnaimel@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Link: https://patch.msgid.link/20260521122147.3584624-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-05-21 12:21:47 +00:00 committed by Jakub Kicinski
parent 4157501b9a
commit 87a1e0fe77
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/sysctl_net_ipv4.c
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@ -1705,10 +1705,10 @@ static __net_exit void ipv4_sysctl_exit_net(struct net *net)
{
const struct ctl_table *table;
kfree(net->ipv4.sysctl_local_reserved_ports);
table = net->ipv4.ipv4_hdr->ctl_table_arg;
unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
kfree(table);
kfree(net->ipv4.sysctl_local_reserved_ports);
}
static __net_initdata struct pernet_operations ipv4_sysctl_ops = {