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KVM: s390: fix possible null pointer dereference in pending_irqs() 

Assure a GISA is in use before accessing the IPM to avoid a
null pointer dereference issue.

Signed-off-by: Michael Mueller <mimu@linux.ibm.com>
Reported-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20190131085247.13826-16-mimu@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Michael Mueller 2019-01-31 09:52:46 +01:00 committed by Christian Borntraeger
parent b1d1e76ed9
commit b9fa6d6ee9
1 changed files with 7 additions and 3 deletions
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10
arch/s390/kvm/interrupt.c
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@ -329,9 +329,13 @@ static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
{
return pending_irqs_no_gisa(vcpu) |
gisa_get_ipm(vcpu->kvm->arch.gisa_int.origin) <<
IRQ_PEND_IO_ISC_7;
struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
unsigned long pending_mask;
pending_mask = pending_irqs_no_gisa(vcpu);
if (gi->origin)
pending_mask |= gisa_get_ipm(gi->origin) << IRQ_PEND_IO_ISC_7;
return pending_mask;
}
static inline int isc_to_irq_type(unsigned long isc)