nfs: Check whether a layout pointer is NULL before free it
The new layout pointer in pnfs_find_alloc_layout() may be NULL because of
out of memory. we must do some check work, otherwise pnfs_free_layout_hdr()
will go wrong because it can not deal with a NULL pointer.
Signed-off-by: Yanchuan Nian <ycnian@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index fe624c9..2878f97 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -925,8 +925,8 @@
if (likely(nfsi->layout == NULL)) { /* Won the race? */
nfsi->layout = new;
return new;
- }
- pnfs_free_layout_hdr(new);
+ } else if (new != NULL)
+ pnfs_free_layout_hdr(new);
out_existing:
pnfs_get_layout_hdr(nfsi->layout);
return nfsi->layout;