[PATCH v6 05/23] powerpc32: Fix pte_offset_kernel() to return NULL for bad pages

From: Christophe Leroy
Date: Thu Feb 04 2016 - 05:53:04 EST


The fixmap related functions try to map kernel pages that are
already mapped through Large TLBs. pte_offset_kernel() has to
return NULL for LTLBs, otherwise the caller will try to access
level 2 table which doesn't exist

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
---
v3: new
v4: no change
v5: no change
v6: no change

arch/powerpc/include/asm/nohash/32/pgtable.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index c82cbf5..e201600 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -309,7 +309,8 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
#define pte_index(address) \
(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset_kernel(dir, addr) \
- ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(addr))
+ (pmd_bad(*(dir)) ? NULL : (pte_t *)pmd_page_vaddr(*(dir)) + \
+ pte_index(addr))
#define pte_offset_map(dir, addr) \
((pte_t *) kmap_atomic(pmd_page(*(dir))) + pte_index(addr))
#define pte_unmap(pte) kunmap_atomic(pte)
--
2.1.0