Bugzilla – Bug 1223776
VUL-0: CVE-2024-27023: kernel: md: fix missing release of 'active_io' for flush
Last modified: 2024-07-08 14:43:48 UTC
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. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-27023 https://www.cve.org/CVERecord?id=CVE-2024-27023 https://git.kernel.org/stable/c/02dad157ba11064d073f5499dc33552b227d5d3a https://git.kernel.org/stable/c/11f81438927f84edfaaeb5d5f10856c3a1c1fc82 https://git.kernel.org/stable/c/6b2ff10390b19a2364af622b6666b690443f9f3f https://git.kernel.org/stable/c/855678ed8534518e2b428bcbcec695de9ba248e8 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-27023.mbox https://bugzilla.redhat.com/show_bug.cgi?id=2278488
All done, closing.