fuse: check connection state on notification

Check if the connection is fully initialized and connected before trying to
process a notification form the fuse server.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 8d5bab05adf4971b918f3a095d59da55f2399f8c..952dd56f0a02d60be556989b05289df45776381c 100644 (file)
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -2098,6 +2098,13 @@ static int fuse_notify_prune(struct fuse_conn *fc, unsigned int size,
 static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
                       unsigned int size, struct fuse_copy_state *cs)
 {
+       /*
+        * Only allow notifications during while the connection is in an
+        * initialized and connected state
+        */
+       if (!fc->initialized || !fc->connected)
+               return -EINVAL;
+
        /* Don't try to move folios (yet) */
        cs->move_folios = false;