releases/4.20.8/cuse-fix-ioctl.patch

   1 From 8a3177db59cd644fde05ba9efee29392dfdec8aa Mon Sep 17 00:00:00 2001
   2 From: Miklos Szeredi <mszeredi@redhat.com>
   3 Date: Wed, 16 Jan 2019 10:27:59 +0100
   4 Subject: cuse: fix ioctl
   5
   6 From: Miklos Szeredi <mszeredi@redhat.com>
   7
   8 commit 8a3177db59cd644fde05ba9efee29392dfdec8aa upstream.
   9
  10 cuse_process_init_reply() doesn't initialize fc->max_pages and thus all
  11 cuse bases ioctls fail with ENOMEM.
  12
  13 Reported-by: Andreas Steinmetz <ast@domdv.de>
  14 Fixes: 5da784cce430 ("fuse: add max_pages to init_out")
  15 Cc: <stable@vger.kernel.org> # v4.20
  16 Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  18
  19 ---
  20  fs/fuse/inode.c |    2 +-
  21  1 file changed, 1 insertion(+), 1 deletion(-)
  22
  23 --- a/fs/fuse/inode.c
  24 +++ b/fs/fuse/inode.c
  25 @@ -628,6 +628,7 @@ void fuse_conn_init(struct fuse_conn *fc
  26         get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
  27         fc->pid_ns = get_pid_ns(task_active_pid_ns(current));
  28         fc->user_ns = get_user_ns(user_ns);
  29 +       fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
  30  }
  31  EXPORT_SYMBOL_GPL(fuse_conn_init);
  32
  33 @@ -1162,7 +1163,6 @@ static int fuse_fill_super(struct super_
  34         fc->user_id = d.user_id;
  35         fc->group_id = d.group_id;
  36         fc->max_read = max_t(unsigned, 4096, d.max_read);
  37 -       fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
  38
  39         /* Used by get_root_inode() */
  40         sb->s_fs_info = fc;