CVE-2024-27023 Information

Description

In the Linux kernel the following vulnerability has been resolved:

md: Fix missing release of ‘active_io’ for flush

submit_flushes atomic_set(&mddev->flush_pending 1); rdev_for_each_rcu(rdev mddev) atomic_inc(&mddev->flush_pending); bi->bi_end_io = md_end_flush submit_bio(bi); / flush io is done first / md_end_flush if (atomic_dec_and_test(&mddev->flush_pending)) percpu_ref_put(&mddev->active_io) -> active_io is not released

if (atomic_dec_and_test(&mddev->flush_pending)) -> missing release of active_io

For consequence mddev_suspend() will wait for ‘active_io’ to be zero forever.

Fix this problem by releasing ‘active_io’ in submit_flushes() if ‘flush_pending’ is decreased to zero.

Reference

https://git.kernel.org/stable/c/6b2ff10390b19a2364af622b6666b690443f9f3f https://git.kernel.org/stable/c/02dad157ba11064d073f5499dc33552b227d5d3a https://git.kernel.org/stable/c/11f81438927f84edfaaeb5d5f10856c3a1c1fc82 https://git.kernel.org/stable/c/855678ed8534518e2b428bcbcec695de9ba248e8