[PATCH v6.6] erofs: fix NULL dereference of dif->bdev_handle in fscache mode

[Greg KH]

On Thu, Jun 27, 2024 at 10:03:38PM +0800, Gao Xiang wrote:
> 
> 
> On 2024/6/27 21:22, Greg KH wrote:
> > On Thu, Jun 27, 2024 at 08:51:37PM +0800, Gao Xiang wrote:
> > > 
> > > 
> > > On 2024/6/27 20:36, Gao Xiang wrote:
> > > > Hi Greg,
> > > > 
> > > > On 2024/6/27 19:16, Greg KH wrote:
> > > 
> > > ...
> > > 
> > > > > 
> > > > > So what specifically should we do here?
> > > > 
> > > > Thanks for the reply..  Honestly I'd like to revert
> > > > 
> > > > block: Provide bdev_open_* functions
> > > > erofs: Convert to use bdev_open_by_path()
> > > > erofs: fix handling kern_mount() failure
> > > > 
> > > > Not quite sure if they can be cleanly reverted, but
> > > > since the upstream doen't have 'bdev_handle' anymore,
> > > > I will resend a proper backport for
> > > > "erofs: fix handling kern_mount() failure".
> > > 
> > > Sigh, I just tried and it seems it causes more
> > > conflicts due to my revert.  It seems another churn..
> > > 
> > > Anyway, on 6.6 LTS only the erofs one uses the
> > > obsolete `struct bdev_handle`, but I think at least
> > > it doesn't cause some serious issue.
> > > 
> > > Hi Greg,
> > > 
> > > Could you just pick up Hongbo's backport to resolve
> > > the NULL dereference issue?
> > 
> > Sure, is that the one earlier in this thread?
> 
> Yeah.
> 
> > 
> > And if so, what is the git commit id of it in Linus's tree?
> 
> commit 8bd90b6ae7856dd5000b75691d905b39b9ea5d6b upstream.

Now queued up, thanks.

greg k-h