drm/i915/gvt: Verify pfn is "valid" before dereferencing "struct page"
[ Upstream commit f046923a ] Check that the pfn found by gfn_to_pfn() is actually backed by "struct page" memory prior to retrieving and dereferencing the page. KVM supports backing guest memory with VM_PFNMAP, VM_IO, etc., and so there is no guarantee the pfn returned by gfn_to_pfn() has an associated "struct page". Fixes: b901b252 ("drm/i915/gvt: Add 2M huge gtt support") Reviewed-by:Yan Zhao <yan.y.zhao@intel.com> Tested-by:
Yongwei Ma <yongwei.ma@intel.com> Reviewed-by:
Zhi Wang <zhi.a.wang@intel.com> Link: https://lore.kernel.org/r/20230729013535.1070024-2-seanjc@google.com Signed-off-by:
Sean Christopherson <seanjc@google.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
Sasha Levin <sashal@kernel.org>
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64369731
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