nfsd4: fix null dereference on replay

if we receive a compound such that:

	- the sessionid, slot, and sequence number in the SEQUENCE op
	  match a cached succesful reply with N ops, and
	- the Nth operation of the compound is a PUTFH, PUTPUBFH,
	  PUTROOTFH, or RESTOREFH,

then nfsd4_sequence will return 0 and set cstate->status to
nfserr_replay_cache.  The current filehandle will not be set.  This will
cause us to call check_nfsd_access with first argument NULL.

To nfsd4_compound it looks like we just succesfully executed an
operation that set a filehandle, but the current filehandle is not set.

Fix this by moving the nfserr_replay_cache earlier.  There was never any
reason to have it after the encode_op label, since the only case where
he hit that is when opdesc->op_func sets it.

Note that there are two ways we could hit this case:

	- a client is resending a previously sent compound that ended
	  with one of the four PUTFH-like operations, or
	- a client is sending a *new* compound that (incorrectly) shares
	  sessionid, slot, and sequence number with a previously sent
	  compound, and the length of the previously sent compound
	  happens to match the position of a PUTFH-like operation in the
	  new compound.

The second is obviously incorrect client behavior.  The first is also
very strange--the only purpose of a PUTFH-like operation is to set the
current filehandle to be used by the following operation, so there's no
point in having it as the last in a compound.

So it's likely this requires a buggy or malicious client to reproduce.

Reported-by: Scott Mayhew <smayhew@redhat.com>
Cc: stable@kernel.vger.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index c453a1998e003d3e900407b266f1a15de5d5d94b..dadb3bf305b22f352a3f91a2df06b30284b4891c 100644 (file)
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1769,6 +1769,12 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
                        opdesc->op_get_currentstateid(cstate, &op->u);
                op->status = opdesc->op_func(rqstp, cstate, &op->u);
 
+               /* Only from SEQUENCE */
+               if (cstate->status == nfserr_replay_cache) {
+                       dprintk("%s NFS4.1 replay from cache\n", __func__);
+                       status = op->status;
+                       goto out;
+               }
                if (!op->status) {
                        if (opdesc->op_set_currentstateid)
                                opdesc->op_set_currentstateid(cstate, &op->u);
@@ -1779,14 +1785,7 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
                        if (need_wrongsec_check(rqstp))
                                op->status = check_nfsd_access(current_fh->fh_export, rqstp);
                }
-
 encode_op:
-               /* Only from SEQUENCE */
-               if (cstate->status == nfserr_replay_cache) {
-                       dprintk("%s NFS4.1 replay from cache\n", __func__);
-                       status = op->status;
-                       goto out;
-               }
                if (op->status == nfserr_replay_me) {
                        op->replay = &cstate->replay_owner->so_replay;
                        nfsd4_encode_replay(&resp->xdr, op);