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KVM: s390: ucontrol: Add missing locking around gmap_remove_child()

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gmap_remove_child() needs to be called while holding the children_lock
of the parent gmap. This was not the case in the error handling path of
kvm_arch_vcpu_create() for UCONTROL guests.

Fix by adding the missing lock.

Fixes: e38c884df9 ("KVM: s390: Switch to new gmap")
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260803124040.126471-10-imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2026-08-03 14:40:36 +02:00
parent ec21534627
commit dab62d2187
1 changed files with 2 additions and 0 deletions
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2
arch/s390/kvm/kvm-s390.c
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@ -3875,7 +3875,9 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
out_ucontrol_uninit:
if (kvm_is_ucontrol(vcpu->kvm)) {
spin_lock(&vcpu->kvm->arch.gmap->children_lock);
gmap_remove_child(vcpu->arch.gmap);
spin_unlock(&vcpu->kvm->arch.gmap->children_lock);
vcpu->arch.gmap = gmap_put(vcpu->arch.gmap);
}
out_free_sie_block: