linux-kernel - Re: [PATCH] jfs: Fix null-ptr-deref in write_special

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Message-ID: <ZxeXBwLCsIwNYmlP@casper.infradead.org>
Date: Tue, 22 Oct 2024 13:13:59 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Edward Adam Davis <eadavis@...com>
Cc: guohui.study@...il.com, brauner@...nel.org, jack@...e.cz,
	jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	lizhi.xu@...driver.com, shaggy@...nel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] jfs: Fix null-ptr-deref in write_special_inodes

On Tue, Oct 15, 2024 at 12:50:05PM +0800, Edward Adam Davis wrote:
> There is a race condition when accessing ipimap and ipbmap.
> 
>         CPU1                              CPU2
> 	====                              ====
> 	jfs_umount
> 	sbi->ipimap = NULL;               lmLogSync

how are we unmounting the filesystem while still writing to it?