On Fri, 2007-11-09 at 03:58 -0600, Kumar Gala wrote:
> kmap_atomic calls flush_tlb_page with a NULL VMA and thus we end
> up dereferencing a NULL pointer to try and get the context.id.
>
> If the VMA is null use the global pid value of 0.
Ack.
> ---
> include/asm-powerpc/tlbflush.h | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/asm-powerpc/tlbflush.h b/include/asm-powerpc/tlbflush.h
> index e7b4c0d..5c91081 100644
> --- a/include/asm-powerpc/tlbflush.h
> +++ b/include/asm-powerpc/tlbflush.h
> @@ -44,13 +44,13 @@ static inline void flush_tlb_mm(struct mm_struct *mm)
> static inline void flush_tlb_page(struct vm_area_struct *vma,
> unsigned long vmaddr)
> {
> - _tlbie(vmaddr, vma->vm_mm->context.id);
> + _tlbie(vmaddr, vma ? vma->vm_mm->context.id : 0);
> }
>
> static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
> unsigned long vmaddr)
> {
> - _tlbie(vmaddr, vma->vm_mm->context.id);
> + _tlbie(vmaddr, vma ? vma->vm_mm->context.id : 0);
> }
>
> static inline void flush_tlb_range(struct vm_area_struct *vma,
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