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Changbin Du ea6932d70e net: make get_net_ns return error if NET_NS is disabled 
There is a panic in socket ioctl cmd SIOCGSKNS when NET_NS is not enabled.
The reason is that nsfs tries to access ns->ops but the proc_ns_operations
is not implemented in this case.

[7.670023] Unable to handle kernel NULL pointer dereference at virtual address 00000010
[7.670268] pgd = 32b54000
[7.670544] [00000010] *pgd=00000000
[7.671861] Internal error: Oops: 5 [#1] SMP ARM
[7.672315] Modules linked in:
[7.672918] CPU: 0 PID: 1 Comm: systemd Not tainted 5.13.0-rc3-00375-g6799d4f2da49 #16
[7.673309] Hardware name: Generic DT based system
[7.673642] PC is at nsfs_evict+0x24/0x30
[7.674486] LR is at clear_inode+0x20/0x9c

The same to tun SIOCGSKNS command.

To fix this problem, we make get_net_ns() return -EINVAL when NET_NS is
disabled. Meanwhile move it to right place net/core/net_namespace.c.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Fixes: c62cce2cae ("net: add an ioctl to get a socket network namespace")
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: David Laight <David.Laight@ACULAB.COM>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-06-12 13:13:08 -07:00
..
acpi
asm-generic mm: remove xlate_dev_kmem_ptr() 2021-05-07 00:26:34 -07:00
clocksource ARM: platform support for Apple M1 2021-04-26 12:30:36 -07:00
crypto
drm
dt-bindings Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2021-05-06 23:37:55 -07:00
keys integrity-v5.13 2021-05-01 15:32:18 -07:00
kunit
kvm
linux net: make get_net_ns return error if NET_NS is disabled 2021-06-12 13:13:08 -07:00
math-emu
media media updates for v5.13-rc1 2021-04-28 09:24:36 -07:00
memory
misc
net net: make get_net_ns return error if NET_NS is disabled 2021-06-12 13:13:08 -07:00
pcmcia
ras
rdma
scsi SCSI misc on 20210428 2021-04-28 17:22:10 -07:00
soc Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
sound
target
trace NFS client updates for Linux 5.13 2021-05-07 11:23:41 -07:00
uapi bluetooth pull request for net: 2021-06-03 15:32:21 -07:00
vdso
video
xen xen/arm: move xen_swiotlb_detect to arm/swiotlb-xen.h 2021-05-14 15:52:05 +02:00