[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,