nfs: handle lock context allocation failures in nfs_create_request
nfs_get_lock_context can return NULL on an allocation failure.
Regression introduced by commit f11ac8db.
Reported-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 9194902..137b549 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -65,6 +65,13 @@
if (req == NULL)
return ERR_PTR(-ENOMEM);
+ /* get lock context early so we can deal with alloc failures */
+ req->wb_lock_context = nfs_get_lock_context(ctx);
+ if (req->wb_lock_context == NULL) {
+ nfs_page_free(req);
+ return ERR_PTR(-ENOMEM);
+ }
+
/* Initialize the request struct. Initially, we assume a
* long write-back delay. This will be adjusted in
* update_nfs_request below if the region is not locked. */
@@ -79,7 +86,6 @@
req->wb_pgbase = offset;
req->wb_bytes = count;
req->wb_context = get_nfs_open_context(ctx);
- req->wb_lock_context = nfs_get_lock_context(ctx);
kref_init(&req->wb_kref);
return req;
}