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irqchip/ti-sci-inta: Fix kernel crash if irq_create_fwspec_mapping fail 

irq_create_fwspec_mapping() can fail, returning 0 as parent_virq. In this
case vint_desc is going to be NULL in ti_sci_inta_alloc_irq() which will
cause NULL pointer dereference.

Also note that irq_create_fwspec_mapping() returns 'unsigned int' so the
check '<=' was wrong.

Use -EINVAL if irq_create_fwspec_mapping() returned with 0.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Peter Ujfalusi 2019-06-04 13:17:51 +03:00 committed by Marc Zyngier
parent db56c5128e
commit eb737b8f44
1 changed files with 2 additions and 2 deletions
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4
drivers/irqchip/irq-ti-sci-inta.c
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@ -159,9 +159,9 @@ static struct ti_sci_inta_vint_desc *ti_sci_inta_alloc_parent_irq(struct irq_dom
parent_fwspec.param[1] = vint_desc->vint_id; parent_fwspec.param[1] = vint_desc->vint_id;
parent_virq = irq_create_fwspec_mapping(&parent_fwspec); parent_virq = irq_create_fwspec_mapping(&parent_fwspec);
if (parent_virq <= 0) { if (parent_virq == 0) {
kfree(vint_desc); kfree(vint_desc);
return ERR_PTR(parent_virq); return ERR_PTR(-EINVAL);
} }
vint_desc->parent_virq = parent_virq; vint_desc->parent_virq = parent_virq;