From: Pavel Begunkov <asml.silence@xxxxxxxxx> commit 1e5d770bb8a23dd01e28e92f4fb0b1093c8bdbe6 upstream. An active ref_node always can be found in ctx->files_data, it's much safer to get it this way instead of poking into files_data->ref_list. Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx # v5.7+ Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/io_uring.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -6854,9 +6854,8 @@ static int io_sqe_files_unregister(struc return -ENXIO; spin_lock(&data->lock); - if (!list_empty(&data->ref_list)) - ref_node = list_first_entry(&data->ref_list, - struct fixed_file_ref_node, node); + ref_node = container_of(data->cur_refs, struct fixed_file_ref_node, + refs); spin_unlock(&data->lock); if (ref_node) percpu_ref_kill(&ref_node->refs);
