ntfs: bound the adjacent cluster in MFT bitmap extension

When the last MFT bitmap run reaches the volume boundary, the direct
allocation path tests the bit for nr_clusters, an invalid LCN. A clear
bit allows an out-of-volume allocation; a bitmap read failure aborts
extension even if valid clusters remain available.

Check the candidate LCN before accessing $Bitmap and fall back to
ntfs_cluster_alloc() with no locality hint when it is outside the volume.

Reviewed-by: Baolin Liu <liubaolin@kylinos.cn>
Signed-off-by: Xuewen Wang <wangxuewen@kylinos.cn>
Reviewed-by: Baolin Liu <liubaolin@kylinos.cn>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

0 files changed, 0 insertions, 0 deletions