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ext4: check for out-of-order index extents in ext4_valid_extent_entri…
…es() commit 8dd27fe upstream. After commit 5946d08 ("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> Reviewed-by: Theodore Ts'o <tytso@mit.edu> Link: https://lore.kernel.org/r/20210908120850.4012324-2-yi.zhang@huawei.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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