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drm/i915/gvt: Avoid dereference a potential null pointer

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Add sanity check for up_irq_info.

Signed-off-by: Xinyun Liu <xinyun.liu@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Xinyun Liu 2018-06-07 22:48:40 +08:00 committed by Zhenyu Wang
parent 0766e2efc6
commit 1f1c60d5b5
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/gvt/interrupt.c
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@ -350,7 +350,8 @@ static void update_upstream_irq(struct intel_vgpu *vgpu,
clear_bits |= (1 << bit);
}
WARN_ON(!up_irq_info);
if (WARN_ON(!up_irq_info))
return;
if (up_irq_info->group == INTEL_GVT_IRQ_INFO_MASTER) {
u32 isr = i915_mmio_reg_offset(up_irq_info->reg_base);