Commit 9b8e8aad authored Apr 02, 2026 by Claudio Imbrenda

KVM: s390: ucontrol: Fix memslot handling



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: 413c98f2 ("KVM: s390: fake memslot for ucontrol VMs")
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>

parent 857e9266

arch/s390/kvm/kvm-s390.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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 */