linux-kernel - Re: [PATCH] powerpc/32: Fix missing NULL pmd check in virt_to

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Date:   Wed, 18 Mar 2020 00:14:50 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, ndesaulniers@...gle.com
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/32: Fix missing NULL pmd check in virt_to_kpte()

On Sat, 2020-03-07 at 10:09:15 UTC, Christophe Leroy wrote:
> Commit 2efc7c085f05 ("powerpc/32: drop get_pteptr()"),
> replaced get_pteptr() by virt_to_kpte(). But virt_to_kpte() lacks a
> NULL pmd check and returns an invalid non NULL pointer when there
> is no page table.
> 
> Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Fixes: 2efc7c085f05 ("powerpc/32: drop get_pteptr()")
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/cc6f0e39000900e5dd1448103a9571f0eccd7d4e

cheers