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af_unix: Do not call kmemdup() for init_net's sysctl table.

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While setting up init_net's sysctl table, we need not duplicate the
global table and can use it directly as ipv4_sysctl_init_net() does.

Unlike IPv4, AF_UNIX does not have a huge sysctl table for now, so it
cannot be a problem, but this patch makes code consistent.

Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20220627233627.51646-1-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima 2022-06-27 16:36:27 -07:00 committed by Jakub Kicinski
parent d521bc0a0f
commit 849d5aa3a1
1 changed files with 13 additions and 6 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

19
net/unix/sysctl_net_unix.c
View file

@ -26,11 +26,16 @@ int __net_init unix_sysctl_register(struct net *net)
{
struct ctl_table *table;
table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
if (table == NULL)
goto err_alloc;
if (net_eq(net, &init_net)) {
table = unix_table;
} else {
table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
if (!table)
goto err_alloc;
table[0].data = &net->unx.sysctl_max_dgram_qlen;
}
table[0].data = &net->unx.sysctl_max_dgram_qlen;
net->unx.ctl = register_net_sysctl(net, "net/unix", table);
if (net->unx.ctl == NULL)
goto err_reg;
@ -38,7 +43,8 @@ int __net_init unix_sysctl_register(struct net *net)
return 0;
err_reg:
kfree(table);
if (net_eq(net, &init_net))
kfree(table);
err_alloc:
return -ENOMEM;
}
@ -49,5 +55,6 @@ void unix_sysctl_unregister(struct net *net)
table = net->unx.ctl->ctl_table_arg;
unregister_net_sysctl_table(net->unx.ctl);
kfree(table);
if (!net_eq(net, &init_net))
kfree(table);
}