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authorTrond Myklebust <trond.myklebust@primarydata.com>2018-01-12 17:42:30 -0500
committerJ. Bruce Fields <bfields@redhat.com>2018-02-05 17:13:16 -0500
commit4f1764172a0aa7395d12b96cae640ca1438c5085 (patch)
treea29f5c6339d179a7975c76c221290c85137a193b
parentd0945caafcccac9d8f4d78f99e0eac9e60386381 (diff)
downloadlinux-4f1764172a0aa7395d12b96cae640ca1438c5085.tar.bz2
nfsd: Detect unhashed stids in nfsd4_verify_open_stid()
The state of the stid is guaranteed by 2 locks: - The nfs4_client 'cl_lock' spinlock - The nfs4_ol_stateid 'st_mutex' mutex so it is quite possible for the stid to be unhashed after lookup, but before calling nfsd4_lock_ol_stateid(). So we do need to check for a zero value for 'sc_type' in nfsd4_verify_open_stid(). Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Tested-by: Checuk Lever <chuck.lever@oracle.com> Cc: stable@vger.kernel.org Fixes: 659aefb68eca "nfsd: Ensure we don't recognise lock stateids..." Signed-off-by: J. Bruce Fields <bfields@redhat.com>
-rw-r--r--fs/nfsd/nfs4state.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index b29b5a185a2c..5a75135f5f53 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3590,6 +3590,7 @@ nfsd4_verify_open_stid(struct nfs4_stid *s)
switch (s->sc_type) {
default:
break;
+ case 0:
case NFS4_CLOSED_STID:
case NFS4_CLOSED_DELEG_STID:
ret = nfserr_bad_stateid;