Unverified Commit a3d32803 authored by Alexandre Ghiti's avatar Alexandre Ghiti Committed by Palmer Dabbelt
Browse files

riscv: Fix config KASAN && SPARSEMEM && !SPARSE_VMEMMAP 



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: 8ad8b727 ("riscv: Add KASAN support")
Signed-off-by: default avatarAlexandre Ghiti <alexandre.ghiti@canonical.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 8b274f22

arch/riscv/mm/kasan_init.c

+1 −2
Original line number Diff line number Diff line
@@ -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,