NFS: Fix filehandle size comparisons in the mount code

Fix a sign issue in xdr_decode_fhstatus3()
Fix incorrect comparison in nfs_validate_mount_data()

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

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c
index 49c7cd0502cc..779d2eb649c5 100644
--- a/fs/nfs/mount_clnt.c
+++ b/fs/nfs/mount_clnt.c
@@ -130,10 +130,11 @@ static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p,
                                 struct mnt_fhstatus *res)
 {
         struct nfs_fh *fh = res->fh;
+        unsigned size;
 
         if ((res->status = ntohl(*p++)) == 0) {
-                int size = ntohl(*p++);
-                if (size <= NFS3_FHSIZE) {
+                size = ntohl(*p++);
+                if (size <= NFS3_FHSIZE && size != 0) {
                         fh->size = size;
                         memcpy(fh->data, p, size);
                 } else