drm/i915: Protect against drm_gem_object not being the first member

Dave Airlie spotted that we had a potential bug should we ever rearrange
the drm_i915_gem_object so not the base drm_gem_object was not its first
member. He noticed that we often convert the return of
drm_gem_object_lookup() immediately into drm_i915_gem_object and then
check the result for nullity. This is only valid when the base object is
the first member and so the superobject has the same address. Play safe
instead and use the compiler to convert back to the original return
address for sanity testing.

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

5 files changed, 16 insertions, 16 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index a8768e2bbeb..f5094bb82d3 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -506,7 +506,7 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data,
 		return ret;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
-	if (obj == NULL) {
+	if (&obj->base == NULL) {
 		ret = -ENOENT;
 		goto unlock;
 	}
@@ -949,7 +949,7 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
 		return ret;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
-	if (obj == NULL) {
+	if (&obj->base == NULL) {
 		ret = -ENOENT;
 		goto unlock;
 	}
@@ -1045,7 +1045,7 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
 		return ret;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
-	if (obj == NULL) {
+	if (&obj->base == NULL) {
 		ret = -ENOENT;
 		goto unlock;
 	}
@@ -1088,7 +1088,7 @@ i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
 		return ret;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
-	if (obj == NULL) {
+	if (&obj->base == NULL) {
 		ret = -ENOENT;
 		goto unlock;
 	}
@@ -1463,7 +1463,7 @@ i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
 		return ret;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
-	if (obj == NULL) {
+	if (&obj->base == NULL) {
 		ret = -ENOENT;
 		goto unlock;
 	}
@@ -3331,7 +3331,7 @@ i915_gem_pin_ioctl(struct drm_device *dev, void *data,
 		return ret;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
-	if (obj == NULL) {
+	if (&obj->base == NULL) {
 		ret = -ENOENT;
 		goto unlock;
 	}
@@ -3382,7 +3382,7 @@ i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
 		return ret;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
-	if (obj == NULL) {
+	if (&obj->base == NULL) {
 		ret = -ENOENT;
 		goto unlock;
 	}
@@ -3419,7 +3419,7 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
 		return ret;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
-	if (obj == NULL) {
+	if (&obj->base == NULL) {
 		ret = -ENOENT;
 		goto unlock;
 	}
@@ -3497,7 +3497,7 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
 		return ret;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file_priv, args->handle));
-	if (obj == NULL) {
+	if (&obj->base == NULL) {
 		ret = -ENOENT;
 		goto unlock;
 	}
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 84fa24e6cca..a72e7b2cb04 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -677,7 +677,7 @@ i915_gem_execbuffer_relocate_slow(struct drm_device *dev,
 	for (i = 0; i < count; i++) {
 		obj = to_intel_bo(drm_gem_object_lookup(dev, file,
 							exec[i].handle));
-		if (obj == NULL) {
+		if (&obj->base == NULL) {
 			DRM_ERROR("Invalid object handle %d at index %d\n",
 				   exec[i].handle, i);
 			ret = -ENOENT;
@@ -1087,7 +1087,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 
 		obj = to_intel_bo(drm_gem_object_lookup(dev, file,
 							exec[i].handle));
-		if (obj == NULL) {
+		if (&obj->base == NULL) {
 			DRM_ERROR("Invalid object handle %d at index %d\n",
 				   exec[i].handle, i);
 			/* prevent error path from reading uninitialized data */
diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
index a093d67b94e..0a896939282 100644
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -286,7 +286,7 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
 	struct drm_i915_gem_object *obj;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
-	if (obj == NULL)
+	if (&obj->base == NULL)
 		return -ENOENT;
 
 	if (!i915_tiling_ok(dev,
@@ -366,7 +366,7 @@ i915_gem_get_tiling(struct drm_device *dev, void *data,
 	struct drm_i915_gem_object *obj;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
-	if (obj == NULL)
+	if (&obj->base == NULL)
 		return -ENOENT;
 
 	mutex_lock(&dev->struct_mutex);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 1a15438512f..40fcbc91139 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5324,7 +5324,7 @@ static int intel_crtc_cursor_set(struct drm_crtc *crtc,
 	}
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, file, handle));
-	if (!obj)
+	if (&obj->base == NULL)
 		return -ENOENT;
 
 	if (obj->base.size < width * height * 4) {
@@ -6563,7 +6563,7 @@ intel_user_framebuffer_create(struct drm_device *dev,
 	int ret;
 
 	obj = to_intel_bo(drm_gem_object_lookup(dev, filp, mode_cmd->handle));
-	if (!obj)
+	if (&obj->base == NULL)
 		return ERR_PTR(-ENOENT);
 
 	intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
diff --git a/drivers/gpu/drm/i915/intel_overlay.c b/drivers/gpu/drm/i915/intel_overlay.c
index 29fb2174eaa..50bc865139a 100644
--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -1156,7 +1156,7 @@ int intel_overlay_put_image(struct drm_device *dev, void *data,
 
 	new_bo = to_intel_bo(drm_gem_object_lookup(dev, file_priv,
 						   put_image_rec->bo_handle));
-	if (!new_bo) {
+	if (&new_bo->base == NULL) {
 		ret = -ENOENT;
 		goto out_free;
 	}