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drm/i915/gvt: Check if get_next_pt_type() always returns a valid value 

According to gtt_type_table[] function get_next_pt_type() may returns
GTT_TYPE_INVALID in some cases. To prevent driver to try to create memory
page with invalid data type, additional check is added.

Signed-off-by: Aleksei Gimbitskii <aleksei.gimbitskii@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Colin Xu <colin.xu@intel.com>
Reviewed-by: Colin Xu <colin.xu@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Aleksei Gimbitskii 2019-04-23 15:04:13 +03:00 committed by Zhenyu Wang
parent 4feeea1d8d
commit 930c8dfea4
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/gvt/gtt.c
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@ -1076,6 +1076,9 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_spt_by_guest_entry(
} else {
int type = get_next_pt_type(we->type);
if (!gtt_type_is_pt(type))
goto err;
spt = ppgtt_alloc_spt_gfn(vgpu, type, ops->get_pfn(we), ips);
if (IS_ERR(spt)) {
ret = PTR_ERR(spt);