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KVM: s390: ucontrol: Fix memslot handling

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Fix memslots handling for UCONTROL guests. Attempts to delete user
memslots will fail, as they should, without the risk of a NULL pointer
dereference.

Fixes: 413c98f24c ("KVM: s390: fake memslot for ucontrol VMs")
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2026-04-02 17:01:35 +02:00
parent 857e92662c
commit 9b8e8aad58
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kvm/kvm-s390.c
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@ -5642,7 +5642,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
if (kvm_is_ucontrol(kvm) && new->id < KVM_USER_MEM_SLOTS)
if (kvm_is_ucontrol(kvm) && new && new->id < KVM_USER_MEM_SLOTS)
return -EINVAL;
/* When we are protected, we should not change the memory slots */