Messages in this thread Patch in this message | | | From | Alexandre Ghiti <> | Subject | [PATCH -fixes 2/4] riscv: Fix config KASAN && SPARSEMEM && !SPARSE_VMEMMAP | Date | Fri, 18 Feb 2022 14:35:11 +0100 |
| |
In order to get the pfn of a struct page* when sparsemem is enabled without vmemmap, the mem_section structures need to be initialized which happens in sparse_init.
But kasan_early_init calls pfn_to_page way before sparse_init is called, which then tries to dereference a null mem_section pointer.
Fix this by removing the usage of this function in kasan_early_init.
Fixes: 8ad8b72721d0 ("riscv: Add KASAN support") Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com> --- arch/riscv/mm/kasan_init.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c index f61f7ca6fe0f..85e849318389 100644 --- a/arch/riscv/mm/kasan_init.c +++ b/arch/riscv/mm/kasan_init.c @@ -202,8 +202,7 @@ asmlinkage void __init kasan_early_init(void) for (i = 0; i < PTRS_PER_PTE; ++i) set_pte(kasan_early_shadow_pte + i, - mk_pte(virt_to_page(kasan_early_shadow_page), - PAGE_KERNEL)); + pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL)); for (i = 0; i < PTRS_PER_PMD; ++i) set_pmd(kasan_early_shadow_pmd + i, -- 2.32.0
| |