Avoid a NULL pointer dereference if the memslot table changes between the exit and the call to kvmppc_e500_shadow_map().
Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini pbonzini@redhat.com --- 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) {