CVE-2024-56780

In the Linux kernel, the following vulnerability has been resolved:

quota: flush quota_release_work upon quota writeback

One of the paths quota writeback is called from is:

freeze_super()

sync_filesystem()

ext4_sync_fs()

dquot_writeback_dquots()

Since we currently don't always flush the quota_release_work queue in

this path, we can end up with the following race:

1. dquot are added to releasing_dquots list during regular operations.

2. FS Freeze starts, however, this does not flush the quota_release_work queue.

3. Freeze completes.

4. Kernel eventually tries to flush the workqueue while FS is frozen which

hits a WARN_ON since transaction gets started during frozen state:

ext4_journal_check_start+0x28/0x110 [ext4] (unreliable)

__ext4_journal_start_sb+0x64/0x1c0 [ext4]

ext4_release_dquot+0x90/0x1d0 [ext4]

quota_release_workfn+0x43c/0x4d0

Which is the following line:

WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);

Which ultimately results in generic/390 failing due to dmesg

noise. This was detected on powerpc machine 15 cores.

To avoid this, make sure to flush the workqueue during

dquot_writeback_dquots() so we dont have any pending workitems after

freeze.