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KVM: s390: Fixes for 4.8 (via kvm/master)

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Here are two fixes found by fuzzing of the ioctl interface.
 Both cases can trigger a WARN_ON_ONCE from user space.
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Merge tag 'kvm-s390-master-4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux

KVM: s390: Fixes for 4.8 (via kvm/master)

Here are two fixes found by fuzzing of the ioctl interface.
Both cases can trigger a WARN_ON_ONCE from user space.
This commit is contained in:
Radim Krčmář 2016-08-12 12:01:51 +02:00
commit 89a1d43ead
1 changed files with 4 additions and 1 deletions
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5
arch/s390/kvm/kvm-s390.c
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@ -1672,6 +1672,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
KVM_SYNC_CRS |
KVM_SYNC_ARCH0 |
KVM_SYNC_PFAULT;
kvm_s390_set_prefix(vcpu, 0);
if (test_kvm_facility(vcpu->kvm, 64))
vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
/* fprs can be synchronized via vrs, even if the guest has no vx. With
@ -2361,8 +2362,10 @@ static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
rc = gmap_mprotect_notify(vcpu->arch.gmap,
kvm_s390_get_prefix(vcpu),
PAGE_SIZE * 2, PROT_WRITE);
if (rc)
if (rc) {
kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
return rc;
}
goto retry;
}