fuse: fix allowing operations

The following operation didn't check if sending the request was allowed:

  setattr
  listxattr
  statfs

Some other operations don't explicitly do the check, but VFS calls
->permission() which checks this.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index fd0735715c14..00bb5a255ded 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -287,6 +287,11 @@ static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
 	struct fuse_statfs_out outarg;
 	int err;
 
+	if (!fuse_allow_task(fc, current)) {
+		buf->f_type = FUSE_SUPER_MAGIC;
+		return 0;
+	}
+
 	req = fuse_get_req(fc);
 	if (IS_ERR(req))
 		return PTR_ERR(req);