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linux-stable/fs/nfsd
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Alexander Sverdlin 8bf902fee5 nfsd: Fix nsfd startup race (again) 
commit b10252c7ae upstream.

Commit bd5ae9288d ("nfsd: register pernet ops last, unregister first")
has re-opened rpc_pipefs_event() race against nfsd_net_id registration
(register_pernet_subsys()) which has been fixed by commit bb7ffbf29e
("nfsd: fix nsfd startup race triggering BUG_ON").

Restore the order of register_pernet_subsys() vs register_cld_notifier().
Add WARN_ON() to prevent a future regression.

Crash info:
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000012
CPU: 8 PID: 345 Comm: mount Not tainted 5.4.144-... #1
pc : rpc_pipefs_event+0x54/0x120 [nfsd]
lr : rpc_pipefs_event+0x48/0x120 [nfsd]
Call trace:
 rpc_pipefs_event+0x54/0x120 [nfsd]
 blocking_notifier_call_chain
 rpc_fill_super
 get_tree_keyed
 rpc_fs_get_tree
 vfs_get_tree
 do_mount
 ksys_mount
 __arm64_sys_mount
 el0_svc_handler
 el0_svc

Fixes: bd5ae9288d ("nfsd: register pernet ops last, unregister first")
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-14 10:57:14 +01:00
..
acl.h nfsd: eliminate an unnecessary acl size limit 2019-08-28 21:13:45 -04:00
auth.c nfsd: auth: Fix gid sorting when rootsquash enabled 2018-01-22 20:13:07 -08:00
auth.h
blocklayout.c block: remove REQ_OP_SCSI_{IN,OUT} 2021-06-30 15:34:19 -06:00
blocklayoutxdr.c
blocklayoutxdr.h
cache.h nfsd4: make drc_slab global, not per-net 2020-06-01 17:44:45 -04:00
current_stateid.h
export.c idmapped-mounts-v5.12 2021-02-23 13:39:45 -08:00
export.h nfsd: report per-export stats 2021-01-25 09:36:28 -05:00
fault_inject.c nfsd: no need to check return value of debugfs_create functions 2019-07-03 16:57:17 +02:00
filecache.c nfsd: Fix a warning for nfsd_file_close_inode 2021-10-01 11:17:40 -04:00
filecache.h nfsd: convert file cache to use over/underflow safe refcount 2020-02-06 11:22:55 -05:00
flexfilelayout.c
flexfilelayoutxdr.c
flexfilelayoutxdr.h
idmap.h
Kconfig scsi: core: Rename CONFIG_BLK_SCSI_REQUEST to CONFIG_SCSI_COMMON 2021-07-28 22:24:27 -04:00
lockd.c Keep read and write fds with each nlm_file 2021-08-23 18:05:31 -04:00
Makefile nfsd: remove fault injection code 2020-09-25 18:01:26 -04:00
netns.h NFSD: delay unmount source's export after inter-server copy completed. 2021-05-25 17:06:51 -04:00
nfs2acl.c NFSD: Update the NFSv2 ACL ACCESS result encoder to use struct xdr_stream 2021-03-22 10:19:01 -04:00
nfs3acl.c nfsd: fix NULL dereference in nfs3svc_encode_getaclres 2021-07-06 20:14:44 -04:00
nfs3proc.c NFSD: Reduce svc_rqst::rq_pages churn during READDIR operations 2021-03-22 10:18:56 -04:00
nfs3xdr.c NFSD: Clean up NFSDDBG_FACILITY macro 2021-03-22 10:19:02 -04:00
nfs4acl.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00
nfs4callback.c nfsd: rpc_peeraddr2str needs rcu lock 2021-07-06 20:14:42 -04:00
nfs4idmap.c nfsd: Use seq_putc() in two functions 2020-07-13 17:28:46 -04:00
nfs4layouts.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nfs4proc.c nfsd: remove redundant assignment to pointer 'this' 2021-07-06 20:14:44 -04:00
nfs4recover.c nfsd: Fix nsfd startup race (again) 2021-12-14 10:57:14 +01:00
nfs4state.c nfsd: fix use-after-free due to delegation race 2021-12-14 10:57:14 +01:00
nfs4xdr.c NFSD: Fix exposure in nfsd4_decode_bitmap() 2021-11-25 09:48:35 +01:00
nfscache.c nfsd: protect concurrent access to nfsd stats counters 2021-01-25 09:36:27 -05:00
nfsctl.c nfsd: Fix nsfd startup race (again) 2021-12-14 10:57:14 +01:00
nfsd.h NFSD: delay unmount source's export after inter-server copy completed. 2021-05-25 17:06:51 -04:00
nfsfh.c NFSD: Update the GETATTR3res encoder to use struct xdr_stream 2021-03-22 10:18:51 -04:00
nfsfh.h NFSD: Constify @fh argument of knfsd_fh_hash() 2021-05-18 13:44:03 -04:00
nfsproc.c nfs: don't allow reexport reclaims 2021-08-26 15:32:28 -04:00
nfssvc.c NFSD: delay unmount source's export after inter-server copy completed. 2021-05-25 17:06:51 -04:00
nfsxdr.c NFSD: Clean up NFSDDBG_FACILITY macro 2021-03-22 10:19:02 -04:00
pnfs.h
state.h nfsd: track filehandle aliasing in nfs4_files 2021-04-19 16:41:36 -04:00
stats.c nfsd: protect concurrent access to nfsd stats counters 2021-01-25 09:36:27 -05:00
stats.h nfsd: report per-export stats 2021-01-25 09:36:28 -05:00
trace.c NFSD: Add SPDX header for fs/nfsd/trace.c 2020-11-30 13:00:24 -05:00
trace.h NFSD: Use new __string_len C macros for nfsd_clid_class 2021-08-17 11:47:52 -04:00
vfs.c New features: 2021-08-31 10:57:06 -07:00
vfs.h NFSD: Update the NFSv3 ACCESS3res encoder to use struct xdr_stream 2021-03-22 10:18:52 -04:00
xdr.h NFSD: Clean up after updating NFSv2 ACL encoders 2021-03-22 10:19:01 -04:00
xdr3.h NFSD: Clean up after updating NFSv3 ACL encoders 2021-03-22 10:19:02 -04:00
xdr4.h NFSD add vfs_fsync after async copy is done 2021-05-25 17:06:51 -04:00
xdr4cb.h NFSD CB_OFFLOAD xdr 2018-09-25 20:34:54 -04:00