nfsd4: avoid NULL deference on strange COPY compounds

With cross-server COPY we've introduced the possibility that the current
or saved filehandle might not have fh_dentry/fh_export filled in, but we
missed a place that assumed it was.  I think this could be triggered by
a compound like:

	PUTFH(foreign filehandle)
	GETATTR
	SAVEFH
	COPY

First, check_if_stalefh_allowed sets no_verify on the first (PUTFH) op.
Then op_func = nfsd4_putfh runs and leaves current_fh->fh_export NULL.
need_wrongsec_check returns true, since this PUTFH has OP_IS_PUTFH_LIKE
set and GETATTR does not have OP_HANDLES_WRONGSEC set.

We should probably also consider tightening the checks in
check_if_stalefh_allowed and double-checking that we don't assume the
filehandle is verified elsewhere in the compound.  But I think this
fixes the immediate issue.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 4e48f1cccab3 "NFSD: allow inter server COPY to have... "
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index d33c39c18cdd7222953ac7d5733ee2c11b72861f..30c75b961d68d848e67fe7a76a1fbc9758da383f 100644 (file)
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -2368,7 +2368,8 @@ nfsd4_proc_compound(struct svc_rqst *rqstp)
                        if (op->opdesc->op_flags & OP_CLEAR_STATEID)
                                clear_current_stateid(cstate);
 
-                       if (need_wrongsec_check(rqstp))
+                       if (current_fh->fh_export &&
+                                       need_wrongsec_check(rqstp))
                                op->status = check_nfsd_access(current_fh->fh_export, rqstp);
                }
 encode_op: