On Mon, Sep 10, 2018 at 11:00:04AM +0200, Christian König wrote:
> Hi Ray,
>
> well those patches doesn't make sense, the pointer is only local to
> the function.
You're right.
I narrowed it with gdb dump from ttm_bo_bulk_move_lru_tail+0x2b, the
use-after-free should be in below codes:
man = &bulk->tt[i].first->bdev->man[TTM_PL_TT];
ttm_bo_bulk_move_helper(&bulk->tt[i], &man->lru[i], false);
Is there a case, when orignal bo is destroyed in the bulk pos, but it
doesn't update pos->first pointer, then we still use it during the bulk
moving?
Thanks,
Ray
>
> Regards,
> Christian.
>
> Am 10.09.2018 um 10:57 schrieb Huang Rui:
> >It avoids to be refered again after freed.
> >
> >Signed-off-by: Huang Rui <ray.huang at amd.com>
> >Cc: Christian König <christian.koenig at amd.com>
> >Cc: Tom StDenis <Tom.StDenis at amd.com>
> >---
> > drivers/gpu/drm/ttm/ttm_bo.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> >diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> >index 138c989..d3ef5f8 100644
> >--- a/drivers/gpu/drm/ttm/ttm_bo.c
> >+++ b/drivers/gpu/drm/ttm/ttm_bo.c
> >@@ -54,6 +54,7 @@ static struct attribute ttm_bo_count = {
> > static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
> > {
> > kfree(bo);
> >+ bo = NULL;
> > }
> > static inline int ttm_mem_type_from_place(const struct ttm_place *place,
>
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