drm/i915: Prevent uninitialised reads during error state capture

error_bo and pinned_bo could be used uninitialised if there were no
active buffers.

Caught by kmemcheck.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 4b5a35c..062f353 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -846,6 +846,8 @@ static void i915_capture_error_state(struct drm_device *dev)
                i++;
        error->pinned_bo_count = i - error->active_bo_count;
 
+       error->active_bo = NULL;
+       error->pinned_bo = NULL;
        if (i) {
                error->active_bo = kmalloc(sizeof(*error->active_bo)*i,
                                           GFP_ATOMIC);