From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Ensure that the client lookup is done safely under the client_lock.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 955027d4dc85..6e6d34111f5f 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3880,12 +3880,14 @@ static __be32 lookup_clientid(clientid_t *clid,
* if we don't have one cached already then we know this is for
* is for v4.0 and "sessions" will be false.
*/
+ spin_lock(&nn->client_lock);
found = find_confirmed_client(clid, false, nn);
/* Cache the nfs4_client in cstate! */
if (found) {
cstate->clp = found;
atomic_inc(&found->cl_refcount);
}
+ spin_unlock(&nn->client_lock);
}
return found ? nfs_ok : nfserr_expired;
}
--
1.9.3
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