Re: [PATCH stable 4.19-5.19] mm: /proc/pid/smaps_rollup: fix no vma's null-deref

[Greg KH <gregkh@linuxfoundation.org>]

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http://daringfireball.net/2007/07/on_top

On Wed, Oct 26, 2022 at 02:32:00PM -0400, Seth Jenkins wrote:
> Hi Greg,
> 
> The upstream commit that fixed the issue was not an intentional fix
> AFAIK, but a refactor to switch to maple tree VMA lookups. I was under
> the impression that there were no plans to backport maple trees back
> to stable trees but do let me know if that presumption is incorrect.
> Assuming they're not getting backported, what do you think of this
> instead:

Yes, as Matthew said, backporting maple trees is not a good idea, we
don't want that.

> c4c84f06285e on upstream resolves this issue as part of the switch to
> using maple trees for VMA lookups, but a fix must still be applied to
> stable trees 4.19-5.19.

That's better, yes.  Please add that and resend a new version.

thanks,

greg k-h