Avoid a NULL pointer dereference if the memslot table changes between the
exit and the call to kvmppc_e500_shadow_map().
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
arch/powerpc/kvm/e500_mmu_host.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
index e5a145b578a4..732335444d68 100644
--- a/arch/powerpc/kvm/e500_mmu_host.c
+++ b/arch/powerpc/kvm/e500_mmu_host.c
@@ -349,6 +349,11 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
* pointer through from the first lookup.
*/
slot = gfn_to_memslot(vcpu_e500->vcpu.kvm, gfn);
+ if (!slot) {
+ ret = -EAGAIN;
+ goto out;
+ }
+
hva = gfn_to_hva_memslot(slot, gfn);
if (tlbsel == 1) {
--
2.47.1
