From: Kristian Høgsberg <krh@redhat.com>
Date: Tue, 3 Mar 2009 19:45:57 +0000 (-0500)
Subject: drm: Return EINVAL on duplicate objects in execbuffer object list
X-Git-Tag: v5.15~35028^2~8
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=b70d11da61d751ad968c6f686d83ac1b0ae41466;p=mirror_ubuntu-kernels.git

drm: Return EINVAL on duplicate objects in execbuffer object list

If userspace passes an object list with the same object appearing more
than once, we end up hitting the BUG_ON() in
i915_gem_object_set_to_gpu_domain() as it gets called a second time
for the same object.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
---

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 17fa40858d26..9186d43be011 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -457,6 +457,12 @@ struct drm_i915_gem_object {
 
 	/** for phy allocated objects */
 	struct drm_i915_gem_phys_object *phys_obj;
+
+	/**
+	 * Used for checking the object doesn't appear more than once
+	 * in an execbuffer object list.
+	 */
+	int in_execbuffer;
 };
 
 /**
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 85685bfd12da..7bdcc752f139 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2469,6 +2469,7 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
 	struct drm_i915_gem_exec_object *exec_list = NULL;
 	struct drm_gem_object **object_list = NULL;
 	struct drm_gem_object *batch_obj;
+	struct drm_i915_gem_object *obj_priv;
 	int ret, i, pinned = 0;
 	uint64_t exec_offset;
 	uint32_t seqno, flush_domains;
@@ -2533,6 +2534,15 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
 			ret = -EBADF;
 			goto err;
 		}
+
+		obj_priv = object_list[i]->driver_private;
+		if (obj_priv->in_execbuffer) {
+			DRM_ERROR("Object %p appears more than once in object list\n",
+				   object_list[i]);
+			ret = -EBADF;
+			goto err;
+		}
+		obj_priv->in_execbuffer = true;
 	}
 
 	/* Pin and relocate */
@@ -2674,8 +2684,13 @@ err:
 	for (i = 0; i < pinned; i++)
 		i915_gem_object_unpin(object_list[i]);
 
-	for (i = 0; i < args->buffer_count; i++)
+	for (i = 0; i < args->buffer_count; i++) {
+		if (object_list[i]) {
+			obj_priv = object_list[i]->driver_private;
+			obj_priv->in_execbuffer = false;
+		}
 		drm_gem_object_unreference(object_list[i]);
+	}
 
 	mutex_unlock(&dev->struct_mutex);