1 files changed, 40 insertions, 67 deletions

diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c
index db8846a0e82e..e6bf45710cc7 100644
--- a/fs/nfs/nfs2xdr.c
+++ b/fs/nfs/nfs2xdr.c
@@ -337,10 +337,10 @@ nfs_xdr_createargs(struct rpc_rqst *req, __be32 *p, struct nfs_createargs *args)
 static int
 nfs_xdr_renameargs(struct rpc_rqst *req, __be32 *p, struct nfs_renameargs *args)
 {
-	p = xdr_encode_fhandle(p, args->fromfh);
-	p = xdr_encode_array(p, args->fromname, args->fromlen);
-	p = xdr_encode_fhandle(p, args->tofh);
-	p = xdr_encode_array(p, args->toname, args->tolen);
+	p = xdr_encode_fhandle(p, args->old_dir);
+	p = xdr_encode_array(p, args->old_name->name, args->old_name->len);
+	p = xdr_encode_fhandle(p, args->new_dir);
+	p = xdr_encode_array(p, args->new_name->name, args->new_name->len);
 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 	return 0;
 }
@@ -423,9 +423,7 @@ nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
 	struct page **page;
 	size_t hdrlen;
 	unsigned int pglen, recvd;
-	u32 len;
 	int status, nr = 0;
-	__be32 *end, *entry, *kaddr;
 
 	if ((status = ntohl(*p++)))
 		return nfs_stat_to_errno(status);
@@ -445,80 +443,59 @@ nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
 	if (pglen > recvd)
 		pglen = recvd;
 	page = rcvbuf->pages;
-	kaddr = p = kmap_atomic(*page, KM_USER0);
-	end = (__be32 *)((char *)p + pglen);
-	entry = p;
-
-	/* Make sure the packet actually has a value_follows and EOF entry */
-	if ((entry + 1) > end)
-		goto short_pkt;
-
-	for (; *p++; nr++) {
-		if (p + 2 > end)
-			goto short_pkt;
-		p++; /* fileid */
-		len = ntohl(*p++);
-		p += XDR_QUADLEN(len) + 1;	/* name plus cookie */
-		if (len > NFS2_MAXNAMLEN) {
-			dprintk("NFS: giant filename in readdir (len 0x%x)!\n",
-						len);
-			goto err_unmap;
-		}
-		if (p + 2 > end)
-			goto short_pkt;
-		entry = p;
-	}
-
-	/*
-	 * Apparently some server sends responses that are a valid size, but
-	 * contain no entries, and have value_follows==0 and EOF==0. For
-	 * those, just set the EOF marker.
-	 */
-	if (!nr && entry[1] == 0) {
-		dprintk("NFS: readdir reply truncated!\n");
-		entry[1] = 1;
-	}
- out:
-	kunmap_atomic(kaddr, KM_USER0);
 	return nr;
- short_pkt:
-	/*
-	 * When we get a short packet there are 2 possibilities. We can
-	 * return an error, or fix up the response to look like a valid
-	 * response and return what we have so far. If there are no
-	 * entries and the packet was short, then return -EIO. If there
-	 * are valid entries in the response, return them and pretend that
-	 * the call was successful, but incomplete. The caller can retry the
-	 * readdir starting at the last cookie.
-	 */
-	entry[0] = entry[1] = 0;
-	if (!nr)
-		nr = -errno_NFSERR_IO;
-	goto out;
-err_unmap:
-	nr = -errno_NFSERR_IO;
-	goto out;
+}
+
+static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
+{
+	dprintk("nfs: %s: prematurely hit end of receive buffer. "
+		"Remaining buffer length is %tu words.\n",
+		func, xdr->end - xdr->p);
 }
 
 __be32 *
-nfs_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus)
+nfs_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, struct nfs_server *server, int plus)
 {
-	if (!*p++) {
-		if (!*p)
+	__be32 *p;
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(!p))
+		goto out_overflow;
+	if (!ntohl(*p++)) {
+		p = xdr_inline_decode(xdr, 4);
+		if (unlikely(!p))
+			goto out_overflow;
+		if (!ntohl(*p++))
 			return ERR_PTR(-EAGAIN);
 		entry->eof = 1;
 		return ERR_PTR(-EBADCOOKIE);
 	}
 
+	p = xdr_inline_decode(xdr, 8);
+	if (unlikely(!p))
+		goto out_overflow;
+
 	entry->ino	  = ntohl(*p++);
 	entry->len	  = ntohl(*p++);
+
+	p = xdr_inline_decode(xdr, entry->len + 4);
+	if (unlikely(!p))
+		goto out_overflow;
 	entry->name	  = (const char *) p;
 	p		 += XDR_QUADLEN(entry->len);
 	entry->prev_cookie	  = entry->cookie;
 	entry->cookie	  = ntohl(*p++);
-	entry->eof	  = !p[0] && p[1];
+
+	p = xdr_inline_peek(xdr, 8);
+	if (p != NULL)
+		entry->eof = !p[0] && p[1];
+	else
+		entry->eof = 0;
 
 	return p;
+
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return ERR_PTR(-EIO);
 }
 
 /*
@@ -596,7 +573,6 @@ nfs_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, void *dummy)
 	struct kvec *iov = rcvbuf->head;
 	size_t hdrlen;
 	u32 len, recvd;
-	char	*kaddr;
 	int	status;
 
 	if ((status = ntohl(*p++)))
@@ -623,10 +599,7 @@ nfs_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, void *dummy)
 		return -EIO;
 	}
 
-	/* NULL terminate the string we got */
-	kaddr = (char *)kmap_atomic(rcvbuf->pages[0], KM_USER0);
-	kaddr[len+rcvbuf->page_base] = '\0';
-	kunmap_atomic(kaddr, KM_USER0);
+	xdr_terminate_string(rcvbuf, len);
 	return 0;
 }