[patch] drm/i915: dereferencing an error pointer

[Dan Carpenter]

We need to check that "ctx" is a valid pointer before dereferencing it.

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
---
Applies to linux-next.

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 9ae3f2c..a82c0ec 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -496,11 +496,13 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
 
 	ctx = create_hw_context(dev, file_priv);
 	mutex_unlock(&dev->struct_mutex);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
 
 	args->ctx_id = ctx->id;
 	DRM_DEBUG_DRIVER("HW context %d created\n", args->ctx_id);
 
-	return PTR_RET(ctx);
+	return 0;
 }
 
 int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,