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 @@
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)) {
