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Sender: Chuck Lever <chucklever@gmail.com>
Subject: [PATCH v2 116/118] NFSD: Update the NFSv3 GETACL argument decoder to
 use struct xdr_stream
From:   Chuck Lever <chuck.lever@oracle.com>
To:     linux-nfs@vger.kernel.org
Date:   Fri, 20 Nov 2020 15:44:04 -0500
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Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs3acl.c |   13 +++++++------
 fs/nfsd/nfs3xdr.c |   11 ++++++++++-
 fs/nfsd/xdr3.h    |    2 ++
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/fs/nfsd/nfs3acl.c b/fs/nfsd/nfs3acl.c
index 7c30876a31a1..b8c452b951dc 100644
--- a/fs/nfsd/nfs3acl.c
+++ b/fs/nfsd/nfs3acl.c
@@ -124,19 +124,20 @@ static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
 /*
  * XDR decode functions
  */
+
 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
 {
+	struct xdr_stream *xdr = &rqstp->rq_xdr_stream;
 	struct nfsd3_getaclargs *args = rqstp->rq_argp;
 
-	p = nfs3svc_decode_fh(p, &args->fh);
-	if (!p)
-		return 0;
-	args->mask = ntohl(*p); p++;
+	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
+		return XDR_DECODE_FAILED;
+	if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
+		return XDR_DECODE_FAILED;
 
-	return xdr_argsize_check(rqstp, p);
+	return XDR_DECODE_DONE;
 }
 
-
 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
 {
 	struct nfsd3_setaclargs *args = rqstp->rq_argp;
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index df593dd9924b..091baf06c494 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -53,7 +53,16 @@ svcxdr_decode_nfstime3(struct xdr_stream *xdr, struct timespec64 *timep)
 	return XDR_DECODE_DONE;
 }
 
-static enum xdr_decode_result
+/**
+ * svcxdr_decode_nfs_fh3 - Decode an NFSv3 file handle
+ * @xdr: XDR stream positioned at an undecoded NFSv3 FH
+ * @fhp: OUT: filled-in server file handle
+ *
+ * Return values:
+ *  %XDR_DECODE_FAILED: The encoded file handle was not valid
+ *  %XDR_DECODE_DONE: Success
+ */
+enum xdr_decode_result
 svcxdr_decode_nfs_fh3(struct xdr_stream *xdr, struct svc_fh *fhp)
 {
 	__be32 *p;
diff --git a/fs/nfsd/xdr3.h b/fs/nfsd/xdr3.h
index 5afb3ce4f062..1fd5328d867a 100644
--- a/fs/nfsd/xdr3.h
+++ b/fs/nfsd/xdr3.h
@@ -308,6 +308,8 @@ int nfs3svc_encode_entry_plus(void *, const char *name,
 __be32 *nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p,
 				struct svc_fh *fhp);
 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp);
+enum xdr_decode_result
+svcxdr_decode_nfs_fh3(struct xdr_stream *xdr, struct svc_fh *fhp);
 
 
 #endif /* _LINUX_NFSD_XDR3_H */