NFSD: Update NFSv2 diropargs decoding to use struct xdr_stream

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index 7b33093..00a7db8 100644 (file)
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -86,6 +86,38 @@ decode_filename(__be32 *p, char **namp, unsigned int *lenp)
        return p;
 }
 
+static bool
+svcxdr_decode_filename(struct xdr_stream *xdr, char **name, unsigned int *len)
+{
+       u32 size, i;
+       __be32 *p;
+       char *c;
+
+       if (xdr_stream_decode_u32(xdr, &size) < 0)
+               return false;
+       if (size == 0 || size > NFS_MAXNAMLEN)
+               return false;
+       p = xdr_inline_decode(xdr, size);
+       if (!p)
+               return false;
+
+       *len = size;
+       *name = (char *)p;
+       for (i = 0, c = *name; i < size; i++, c++)
+               if (*c == '\0' || *c == '/')
+                       return false;
+
+       return true;
+}
+
+static bool
+svcxdr_decode_diropargs(struct xdr_stream *xdr, struct svc_fh *fhp,
+                       char **name, unsigned int *len)
+{
+       return svcxdr_decode_fhandle(xdr, fhp) &&
+               svcxdr_decode_filename(xdr, name, len);
+}
+
 static __be32 *
 decode_sattr(__be32 *p, struct iattr *iap, struct user_namespace *userns)
 {
@@ -234,13 +266,10 @@ nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
 int
 nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
 {
+       struct xdr_stream *xdr = &rqstp->rq_arg_stream;
        struct nfsd_diropargs *args = rqstp->rq_argp;
 
-       if (!(p = decode_fh(p, &args->fh))
-        || !(p = decode_filename(p, &args->name, &args->len)))
-               return 0;
-
-       return xdr_argsize_check(rqstp, p);
+       return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
 }
 
 int