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Date: Tue, 28 Apr 2020 20:25:13 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Sean Christopherson <sean.j.christopherson@...el.com>, Cornelia Huck <cohuck@...hat.com>, Paolo Bonzini <pbonzini@...hat.com> Subject: [PATCH 4.19 101/131] KVM: s390: Return last valid slot if approx index is out-of-bounds From: Sean Christopherson <sean.j.christopherson@...el.com> commit 97daa028f3f621adff2c4f7b15fe0874e5b5bd6c upstream. Return the index of the last valid slot from gfn_to_memslot_approx() if its binary search loop yielded an out-of-bounds index. The index can be out-of-bounds if the specified gfn is less than the base of the lowest memslot (which is also the last valid memslot). Note, the sole caller, kvm_s390_get_cmma(), ensures used_slots is non-zero. Fixes: afdad61615cc3 ("KVM: s390: Fix storage attributes migration with memory slots") Cc: stable@...r.kernel.org # 4.19.x: 0774a964ef56: KVM: Fix out of range accesses to memslots Cc: stable@...r.kernel.org # 4.19.x Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com> Message-Id: <20200408064059.8957-3-sean.j.christopherson@...el.com> Reviewed-by: Cornelia Huck <cohuck@...hat.com> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/s390/kvm/kvm-s390.c | 3 +++ 1 file changed, 3 insertions(+) --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -1666,6 +1666,9 @@ static int gfn_to_memslot_approx(struct start = slot + 1; } + if (start >= slots->used_slots) + return slots->used_slots - 1; + if (gfn >= memslots[start].base_gfn && gfn < memslots[start].base_gfn + memslots[start].npages) { atomic_set(&slots->lru_slot, start);
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