From fc1794c5b04f5322bad05385cd91b52ec85aab72 Mon Sep 17 00:00:00 2001
From: Fred Isaman <iisaman@netapp.com>
Date: Thu, 6 Jan 2011 11:36:27 +0000
Subject: pnfs: check that partial LAYOUTGET return is ignored

Either a bad server reply, or our ignoring of multiple array segments in
a reply, can cause a reply to not meet our requirements.  Ensure
that we ignore such replies.

Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index c00b673..cd99064 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -660,6 +660,17 @@ pnfs_layout_process(struct nfs4_layoutget *lgp)
 	struct inode *ino = lo->plh_inode;
 	int status = 0;
 
+	/* Verify we got what we asked for.
+	 * Note that because the xdr parsing only accepts a single
+	 * element array, this can fail even if the server is behaving
+	 * correctly.
+	 */
+	if (lgp->args.range.iomode > res->range.iomode ||
+	    res->range.offset != 0 ||
+	    res->range.length != NFS4_MAX_UINT64) {
+		status = -EINVAL;
+		goto out;
+	}
 	/* Inject layout blob into I/O device driver */
 	lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res);
 	if (!lseg || IS_ERR(lseg)) {
-- 
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