[PATCH 1/5] KVM: e500: retry if no memslot is found
From: Paolo Bonzini <pbonzini@redhat.com>
Date: 2025-01-09 13:38:28
Also in:
kvm, lkml, regressions, stable
Subsystem:
kernel virtual machine for powerpc (kvm/powerpc), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
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) {
--
2.47.1