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KVM: PPC: Book3S HV: fix incorrect NULL check on list iterator

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commit 300981abddcb13f8f06ad58f52358b53a8096775 upstream.

The bug is here:
	if (!p)
                return ret;

The list iterator value 'p' will *always* be set and non-NULL by
list_for_each_entry(), so it is incorrect to assume that the iterator
value will be NULL if the list is empty or no element is found.

To fix the bug, Use a new value 'iter' as the list iterator, while use
the old value 'p' as a dedicated variable to point to the found element.

Fixes: dfaa973ae9 ("KVM: PPC: Book3S HV: In H_SVM_INIT_DONE, migrate remaining normal-GFNs to secure-GFNs")
Cc: stable@vger.kernel.org # v5.9+
Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220414062103.8153-1-xiam0nd.tong@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiaomeng Tong 2022-04-14 14:21:03 +08:00 committed by Greg Kroah-Hartman
parent 91a36ec160
commit 4c4a11c74a
1 changed files with 5 additions and 3 deletions
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8
arch/powerpc/kvm/book3s_hv_uvmem.c
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@ -359,13 +359,15 @@ static bool kvmppc_gfn_is_uvmem_pfn(unsigned long gfn, struct kvm *kvm,
static bool kvmppc_next_nontransitioned_gfn(const struct kvm_memory_slot *memslot,
struct kvm *kvm, unsigned long *gfn)
{
struct kvmppc_uvmem_slot *p;
struct kvmppc_uvmem_slot *p = NULL, *iter;
bool ret = false;
unsigned long i;
list_for_each_entry(p, &kvm->arch.uvmem_pfns, list)
if (*gfn >= p->base_pfn && *gfn < p->base_pfn + p->nr_pfns)
list_for_each_entry(iter, &kvm->arch.uvmem_pfns, list)
if (*gfn >= iter->base_pfn && *gfn < iter->base_pfn + iter->nr_pfns) {
p = iter;
break;
}
if (!p)
return ret;
/*