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Subject[PATCH AUTOSEL 4.9 002/141] nfsd4: avoid NULL deference on strange COPY compounds
From: "J. Bruce Fields" <>

[ Upstream commit d781e3df710745fbbaee4eb07fd5b64331a1b175 ]

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)

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 <>
Fixes: 4e48f1cccab3 "NFSD: allow inter server COPY to have... "
Signed-off-by: J. Bruce Fields <>
Signed-off-by: Sasha Levin <>
fs/nfsd/nfs4proc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 66985a6a7047b..33537bbb70b36 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1800,7 +1800,8 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
if (opdesc->op_flags & OP_CLEAR_STATEID)

- if (need_wrongsec_check(rqstp))
+ if (current_fh->fh_export &&
+ need_wrongsec_check(rqstp))
op->status = check_nfsd_access(current_fh->fh_export, rqstp);
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