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

[Greg KH]

On Thu, Jun 27, 2024 at 05:50:26PM +0800, Gao Xiang wrote:
> 
> 
> On 2024/6/27 17:35, Gao Xiang wrote:
> > 
> > 
> > On 2024/6/27 17:11, Hongbo Li wrote:
> 
> ..
> 
> > > 
> > > The reason is the same with 8bd90b6ae7856("erofs: fix NULL dereference of dif->bdev_handle in fscache mode") in mainline. So we should backport this
> > > patch into stable linux-6.6.y to avoid this bug.
> > 
> > Yes, commit 8bd90b6ae785 should be backported to
> > Linux 6.6.y LTS immediately.
> 
> BTW, It seems that
> 
> commit "erofs: Convert to use bdev_open_by_path()" was
> backported as a dependency since v6.6.23 even I
> explicitly commented that this patch is unnecessary
> and I tend to manually backport instead as below:
> 
> https://lore.kernel.org/r/ZgDHG8Ucl3EkY4ZS@debian
> 
> 
> However, my comment was eventually ignored and
> some other related fix like
> "erofs: fix NULL dereference of dif->bdev_handle in fscache mode"
> 
> wasn't backported along with
> "erofs: Convert to use bdev_open_by_path()"

Sorry, I missed that somehow, my fault.

> So the affected 6.6 LTS versions seem to be
> v6.6.23 ~ v6.6.35 (current)

So what specifically should we do here?

thanks,

greg k-h