From: J. Bruce Fields bfields@redhat.com
[ Upstream commit 074b07d94e0bb6ddce5690a9b7e2373088e8b33a ]
RTM says "If the special ONE stateid is passed to nfs4_preprocess_stateid_op(), it returns status=0 but does not set *cstid. nfsd4_copy_notify() depends on stid being set if status=0, and thus can crash if the client sends the right COPY_NOTIFY RPC."
RFC 7862 says "The cna_src_stateid MUST refer to either open or locking states provided earlier by the server. If it is invalid, then the operation MUST fail."
The RFC doesn't specify an error, and the choice doesn't matter much as this is clearly illegal client behavior, but bad_stateid seems reasonable.
Simplest is just to guarantee that nfs4_preprocess_stateid_op, called with non-NULL cstid, errors out if it can't return a stateid.
Reported-by: rtm@csail.mit.edu Fixes: 624322f1adc5 ("NFSD add COPY_NOTIFY operation") Signed-off-by: J. Bruce Fields bfields@redhat.com Signed-off-by: Chuck Lever chuck.lever@oracle.com Reviewed-by: Olga Kornievskaia kolga@netapp.com Tested-by: Olga Kornievskaia kolga@netapp.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/nfsd/nfs4state.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 1956d377d1a60..b94b3bb2b8a6e 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -6040,7 +6040,11 @@ nfs4_preprocess_stateid_op(struct svc_rqst *rqstp, *nfp = NULL;
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { - status = check_special_stateids(net, fhp, stateid, flags); + if (cstid) + status = nfserr_bad_stateid; + else + status = check_special_stateids(net, fhp, stateid, + flags); goto done; }