[Devel] [PATCH hci-8.1 v4 03/11] dm-ploop: reject a delta header whose BAT does not cover the target

[no-reply at sashiko.virtuozzo.com]

> ploop_setup_metadata() takes the number of BAT entries from m_Size of
> the top delta header, but checks only m_SizeInSectors_v2 against the
> target length. A header with a small m_Size (including zero) and a large
> enough m_SizeInSectors_v2 passes all checks. Requests past the last BAT
> entry then hit WARN_ONCE() in ploop_rq_valid(), which panics the host
> with panic_on_warn.
> 
> Reject the header if the BAT does not cover the target, taking the
> skip_off shift of request positions into account.
> 
> https://virtuozzo.atlassian.net/browse/VSTOR-148171
> Feature: dm-ploop: ploop target driver
> 
> Signed-off-by: Alexander Ivanov <alexander.ivanov at virtuozzo.com>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.vzint.dev/#/patchset/20261012132646.41494-1-alexander.ivanov@virtuozzo.com?part=3