KVM: Fix out of range accesses to memslots
Reset the LRU slot if it becomes invalid when deleting a memslot to fix an out-of-bounds/use-after-free access when searching through memslots. Explicitly check for there being no used slots in search_memslots(), and in the caller of s390's approximation variant. Fixes: 36947254 ("KVM: Dynamically size memslot array based on number of used slots") Reported-by: NQian Cai <cai@lca.pw> Cc: Peter Xu <peterx@redhat.com> Signed-off-by: NSean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200320205546.2396-2-sean.j.christopherson@intel.com> Acked-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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