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| author | Mike Snitzer <[email protected]> | 2024-10-03 19:34:58 +0000 |
|---|---|---|
| committer | Anna Schumaker <[email protected]> | 2024-10-03 20:19:43 +0000 |
| commit | 65f2a5c366353da6fa724c68347e1de954928143 (patch) | |
| tree | 3dbc942931e5b9c55c54519e9fcf846b841cd8be /rust/helpers/workqueue.c | |
| parent | NFSv4: Prevent NULL-pointer dereference in nfs42_complete_copies() (diff) | |
| download | kernel-65f2a5c366353da6fa724c68347e1de954928143.tar.gz kernel-65f2a5c366353da6fa724c68347e1de954928143.zip | |
nfs_common: fix race in NFS calls to nfsd_file_put_local() and nfsd_serv_put()
Add nfs_to_nfsd_file_put_local() interface to fix race with nfsd
module unload. Similarly, use RCU around nfs_open_local_fh()'s error
path call to nfs_to->nfsd_serv_put(). Holding RCU ensures that NFS
will safely _call and return_ from its nfs_to calls into the NFSD
functions nfsd_file_put_local() and nfsd_serv_put().
Otherwise, if RCU isn't used then there is a narrow window when NFS's
reference for the nfsd_file and nfsd_serv are dropped and the NFSD
module could be unloaded, which could result in a crash from the
return instruction for either nfs_to->nfsd_file_put_local() or
nfs_to->nfsd_serv_put().
Reported-by: NeilBrown <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Signed-off-by: Anna Schumaker <[email protected]>
Diffstat (limited to 'rust/helpers/workqueue.c')
0 files changed, 0 insertions, 0 deletions