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arm64: ptdump: Don't override the level when operating on the stage-2 tables

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Ptdump uses the init_mm structure directly to dump the kernel
pagetables. When ptdump is called on the stage-2 pagetables, this mm
argument is not used. Prevent the level from being overwritten by
checking the argument against NULL.

Signed-off-by: Sebastian Ene <sebastianene@google.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20240909124721.1672199-5-sebastianene@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Sebastian Ene
2024-09-09 12:47:20 +00:00
committed by Marc Zyngier
parent 9182301a7b
commit 79c4c7284f
1 changed files with 2 additions and 2 deletions
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arch/arm64/mm/ptdump.c
+2 -2
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@@ -197,8 +197,8 @@ void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
u64 prot = 0;
/* check if the current level has been folded dynamically */
if ((level == 1 && mm_p4d_folded(st->mm)) ||
(level == 2 && mm_pud_folded(st->mm)))
if (st->mm && ((level == 1 && mm_p4d_folded(st->mm)) ||
(level == 2 && mm_pud_folded(st->mm))))
level = 0;
if (level >= 0)