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Subject: [PATCH 11/29] lockd: Update the NLMv1 SHARE arguments decoder to use
 struct xdr_stream
From:   Chuck Lever <chuck.lever@oracle.com>
To:     bfields@fieldses.org
Cc:     linux-nfs@vger.kernel.org
Date:   Thu, 03 Jun 2021 16:51:40 -0400
Message-ID: <162275350045.32691.7654147542003907709.stgit@klimt.1015granger.net>
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Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/lockd/xdr.c |   96 +++++++++++++++-----------------------------------------
 1 file changed, 26 insertions(+), 70 deletions(-)

diff --git a/fs/lockd/xdr.c b/fs/lockd/xdr.c
index 421613170e5f..c496f18eff06 100644
--- a/fs/lockd/xdr.c
+++ b/fs/lockd/xdr.c
@@ -21,8 +21,6 @@
 
 #include "svcxdr.h"
 
-#define NLMDBG_FACILITY		NLMDBG_XDR
-
 
 static inline loff_t
 s32_to_loff_t(__s32 offset)
@@ -46,33 +44,6 @@ loff_t_to_s32(loff_t offset)
 /*
  * XDR functions for basic NLM types
  */
-static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
-{
-	unsigned int	len;
-
-	len = ntohl(*p++);
-	
-	if(len==0)
-	{
-		c->len=4;
-		memset(c->data, 0, 4);	/* hockeypux brain damage */
-	}
-	else if(len<=NLM_MAXCOOKIELEN)
-	{
-		c->len=len;
-		memcpy(c->data, p, len);
-		p+=XDR_QUADLEN(len);
-	}
-	else 
-	{
-		dprintk("lockd: bad cookie size %d (only cookies under "
-			"%d bytes are supported.)\n",
-				len, NLM_MAXCOOKIELEN);
-		return NULL;
-	}
-	return p;
-}
-
 static inline __be32 *
 nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
 {
@@ -82,22 +53,6 @@ nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
 	return p;
 }
 
-static __be32 *
-nlm_decode_fh(__be32 *p, struct nfs_fh *f)
-{
-	unsigned int	len;
-
-	if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
-		dprintk("lockd: bad fhandle size %d (should be %d)\n",
-			len, NFS2_FHSIZE);
-		return NULL;
-	}
-	f->size = NFS2_FHSIZE;
-	memset(f->data, 0, sizeof(f->data));
-	memcpy(f->data, p, NFS2_FHSIZE);
-	return p + XDR_QUADLEN(NFS2_FHSIZE);
-}
-
 /*
  * NLM file handles are defined by specification to be a variable-length
  * XDR opaque no longer than 1024 bytes. However, this implementation
@@ -128,12 +83,6 @@ svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
 /*
  * Encode and decode owner handle
  */
-static inline __be32 *
-nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
-{
-	return xdr_decode_netobj(p, oh);
-}
-
 static inline __be32 *
 nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
 {
@@ -339,35 +288,42 @@ nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
 	return 1;
 }
 
-int
-nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
-{
-	struct nlm_res *resp = rqstp->rq_resp;
-
-	if (!(p = nlm_encode_testres(p, resp)))
-		return 0;
-	return xdr_ressize_check(rqstp, p);
-}
-
 int
 nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
 {
+	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	struct nlm_lock	*lock = &argp->lock;
 
 	memset(lock, 0, sizeof(*lock));
 	locks_init_lock(&lock->fl);
-	lock->svid = ~(u32) 0;
+	lock->svid = ~(u32)0;
 
-	if (!(p = nlm_decode_cookie(p, &argp->cookie))
-	 || !(p = xdr_decode_string_inplace(p, &lock->caller,
-					    &lock->len, NLM_MAXSTRLEN))
-	 || !(p = nlm_decode_fh(p, &lock->fh))
-	 || !(p = nlm_decode_oh(p, &lock->oh)))
+	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
 		return 0;
-	argp->fsm_mode = ntohl(*p++);
-	argp->fsm_access = ntohl(*p++);
-	return xdr_argsize_check(rqstp, p);
+	if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
+		return 0;
+	if (!svcxdr_decode_fhandle(xdr, &lock->fh))
+		return 0;
+	if (!svcxdr_decode_owner(xdr, &lock->oh))
+		return 0;
+	/* XXX: Range checks are missing in the original code */
+	if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
+		return 0;
+	if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
+		return 0;
+
+	return 1;
+}
+
+int
+nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nlm_res *resp = rqstp->rq_resp;
+
+	if (!(p = nlm_encode_testres(p, resp)))
+		return 0;
+	return xdr_ressize_check(rqstp, p);
 }
 
 int