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Commit ae254dac authored by Andrew Elble's avatar Andrew Elble Committed by J. Bruce Fields
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nfsd: check for use of the closed special stateid



Prevent the use of the closed (invalid) special stateid by clients.

Signed-off-by: default avatarAndrew Elble <aweits@rit.edu>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 64ebe124
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+5 −2
Original line number Diff line number Diff line
@@ -72,6 +72,7 @@ static u64 current_sessionid = 1;
#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
#define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
#define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
#define CLOSE_STATEID(stateid)  (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))

/* forward declarations */
static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
@@ -4936,7 +4937,8 @@ static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
	struct nfs4_stid *s;
	__be32 status = nfserr_bad_stateid;

	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
		CLOSE_STATEID(stateid))
		return status;
	/* Client debugging aid. */
	if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
@@ -4994,7 +4996,8 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
	else if (typemask & NFS4_DELEG_STID)
		typemask |= NFS4_REVOKED_DELEG_STID;

	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
		CLOSE_STATEID(stateid))
		return nfserr_bad_stateid;
	status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
	if (status == nfserr_stale_clientid) {