On Wed, Sep 08, 2021 at 08:08:48PM +0800, Zhang Yi wrote:

After commit 5946d089379a ("ext4: check for overlapping extents in
ext4_valid_extent_entries()"), we can check out the overlapping extent
entry in leaf extent blocks. But the out-of-order extent entry in index
extent blocks could also trigger bad things if the filesystem is
inconsistent. So this patch add a check to figure out the out-of-order
index extents and return error.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>

Looks good,

Reviewed-by: Theodore Ts'o <tytso@mit.edu>