KVM: PPC: NULL return of kvmppc_mmu_hpte_cache_next should be handled

NULL return of kvmppc_mmu_hpte_cache_next should be handled

Signed-off-by: Zhouyi Zhou <yizhouzhou@ict.ac.cn>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s_32_mmu_host.c b/arch/powerpc/kvm/book3s_32_mmu_host.c
index 3a0abd2e5a15..5fac89dfe4cd 100644
--- a/arch/powerpc/kvm/book3s_32_mmu_host.c
+++ b/arch/powerpc/kvm/book3s_32_mmu_host.c
@@ -243,6 +243,11 @@ next_pteg:
         /* Now tell our Shadow PTE code about the new page */
 
         pte = kvmppc_mmu_hpte_cache_next(vcpu);
+        if (!pte) {
+                kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT);
+                r = -EAGAIN;
+                goto out;
+        }
 
         dprintk_mmu("KVM: %c%c Map 0x%llx: [%lx] 0x%llx (0x%llx) -> %lx\n",
                     orig_pte->may_write ? 'w' : '-',