From 1f1c60d5b577377d07863f3e0891e63a0a56a3ad Mon Sep 17 00:00:00 2001
From: Xinyun Liu <xinyun.liu@intel.com>
Date: Thu, 7 Jun 2018 22:48:40 +0800
Subject: [PATCH] drm/i915/gvt: Avoid dereference a potential null pointer
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>
---
drivers/gpu/drm/i915/gvt/interrupt.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gvt/interrupt.c b/drivers/gpu/drm/i915/gvt/interrupt.c
index 7a041b368f68..1d79596da510 100644
--- a/drivers/gpu/drm/i915/gvt/interrupt.c
+++ b/drivers/gpu/drm/i915/gvt/interrupt.c
@@ -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);
--
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