From: Alexandre Ghiti alexandre.ghiti@canonical.com
commit a3d328037846d013bb4c7f3777241e190e4c75e1 upstream.
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 Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/mm/kasan_init.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/arch/riscv/mm/kasan_init.c +++ b/arch/riscv/mm/kasan_init.c @@ -21,8 +21,7 @@ asmlinkage void __init kasan_early_init(
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,