NFS: Prevent garbage cinfo->ds from leaking out

This is a bugfix that applies on top of the previous directio patches,
that fixes a bug introduced in "NFS: create struct nfs_commit_info".

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

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 806a55f513d9..80a63f6d9e14 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -1184,7 +1184,12 @@ filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
 static struct pnfs_ds_commit_info *
 filelayout_get_ds_info(struct inode *inode)
 {
-        return &FILELAYOUT_FROM_HDR(NFS_I(inode)->layout)->commit_info;
+        struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
+
+        if (layout == NULL)
+                return NULL;
+        else
+                return &FILELAYOUT_FROM_HDR(layout)->commit_info;
 }
 
 static struct pnfs_layoutdriver_type filelayout_type = {