Re: [PATCH] jfs: fix uaf in jfs_syncpt

[Matthew Wilcox]

On Tue, Feb 20, 2024 at 11:55:18AM +0800, Edward Adam Davis wrote:
> During the execution of the jfs lazy commit, the jfs file system was unmounted,
> causing the sbi and jfs log objects to be released, triggering this issue.
> The solution is to add mutex to synchronize jfs lazy commit and jfs unmount 
> operations.

Why is that the solution?  LAZY_LOCK with IN_LAZYCOMMIT is supposed to
cover this.  Please be more verbose in your commit messages.  Describe
what is going wrong and why; that will allow people to understand why
this is the correct solution to the problem.