From 044959715f370b24870c95df3940add8710c5a29 Mon Sep 17 00:00:00 2001
From: Chuck Lever <chuck.lever@oracle.com>
Date: Tue, 3 Nov 2020 15:03:50 -0500
Subject: [PATCH] NFSD: Replace READ* macros in nfsd4_decode_getdeviceinfo()

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4xdr.c | 48 +++++++++++++++++++++++++++--------------------
 1 file changed, 28 insertions(+), 20 deletions(-)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 205e07d2b9dd..b244d16eeade 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -638,6 +638,21 @@ nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
 	return nfsd4_decode_opaque(argp, owner);
 }
 
+#ifdef CONFIG_NFSD_PNFS
+static __be32
+nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
+		       struct nfsd4_deviceid *devid)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE);
+	if (!p)
+		return nfserr_bad_xdr;
+	memcpy(devid, p, sizeof(*devid));
+	return nfs_ok;
+}
+#endif /* CONFIG_NFSD_PNFS */
+
 static __be32
 nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp,
 			struct nfs4_sessionid *sessionid)
@@ -1765,27 +1780,20 @@ static __be32
 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
 		struct nfsd4_getdeviceinfo *gdev)
 {
-	DECODE_HEAD;
-	u32 num, i;
+	__be32 status;
 
-	READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
-	COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
-	gdev->gd_layout_type = be32_to_cpup(p++);
-	gdev->gd_maxcount = be32_to_cpup(p++);
-	num = be32_to_cpup(p++);
-	if (num) {
-		if (num > 1000)
-			goto xdr_error;
-		READ_BUF(4 * num);
-		gdev->gd_notify_types = be32_to_cpup(p++);
-		for (i = 1; i < num; i++) {
-			if (be32_to_cpup(p++)) {
-				status = nfserr_inval;
-				goto out;
-			}
-		}
-	}
-	DECODE_TAIL;
+	status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
+	if (status)
+		return status;
+	if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
+		return nfserr_bad_xdr;
+	if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
+		return nfserr_bad_xdr;
+	if (xdr_stream_decode_uint32_array(argp->xdr,
+					   &gdev->gd_notify_types, 1) < 0)
+		return nfserr_bad_xdr;
+
+	return nfs_ok;
 }
 
 static __be32