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| author | Yonatan Linik <yonatanlinik@gmail.com> | 2020-12-14 22:25:50 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-12-14 19:39:30 -0800 |
| commit | a268e0f2455c32653140775662b40c2b1f1b2efa (patch) | |
| tree | a436bd43204747ab03903f3c3d2c3724d4f895a0 /net/packet | |
| parent | 102f19d611acbd5f90608e797faba8928b6955d7 (diff) | |
| download | linux-a268e0f2455c32653140775662b40c2b1f1b2efa.tar.bz2 | |
net: fix proc_fs init handling in af_packet and tls
proc_fs was used, in af_packet, without a surrounding #ifdef,
although there is no hard dependency on proc_fs.
That caused the initialization of the af_packet module to fail
when CONFIG_PROC_FS=n.
Specifically, proc_create_net() was used in af_packet.c,
and when it fails, packet_net_init() returns -ENOMEM.
It will always fail when the kernel is compiled without proc_fs,
because, proc_create_net() for example always returns NULL.
The calling order that starts in af_packet.c is as follows:
packet_init()
register_pernet_subsys()
register_pernet_operations()
__register_pernet_operations()
ops_init()
ops->init() (packet_net_ops.init=packet_net_init())
proc_create_net()
It worked in the past because register_pernet_subsys()'s return value
wasn't checked before this Commit 36096f2f4fa0 ("packet: Fix error path in
packet_init.").
It always returned an error, but was not checked before, so everything
was working even when CONFIG_PROC_FS=n.
The fix here is simply to add the necessary #ifdef.
This also fixes a similar error in tls_proc.c, that was found by Jakub
Kicinski.
Fixes: d26b698dd3cd ("net/tls: add skeleton of MIB statistics")
Fixes: 36096f2f4fa0 ("packet: Fix error path in packet_init")
Signed-off-by: Yonatan Linik <yonatanlinik@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/packet')
| -rw-r--r-- | net/packet/af_packet.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index a667b19eab78..de8e8dbbdeb8 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -4629,9 +4629,11 @@ static int __net_init packet_net_init(struct net *net) mutex_init(&net->packet.sklist_lock); INIT_HLIST_HEAD(&net->packet.sklist); +#ifdef CONFIG_PROC_FS if (!proc_create_net("packet", 0, net->proc_net, &packet_seq_ops, sizeof(struct seq_net_private))) return -ENOMEM; +#endif /* CONFIG_PROC_FS */ return 0; } |