From: jsg <jsg@openbsd.org>
Date: Tue, 28 Mar 2023 04:11:29 +0000 (+0000)
Subject: drm/ttm: Fix a NULL pointer dereference
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=52e4ee52ec2a73e19336239e3e9f82673d734dd7;p=openbsd

drm/ttm: Fix a NULL pointer dereference

From Thomas Hellstrom
9ba1720f6c4a0f13c3f3cb5c28132ee75555d04f in linux-6.1.y/6.1.21
9a9a8fe26751334b7739193a94eba741073b8a55 in mainline linux
---

diff --git a/sys/dev/pci/drm/ttm/ttm_device.c b/sys/dev/pci/drm/ttm/ttm_device.c
index c3dfc192e4a..d4ad7edf700 100644
--- a/sys/dev/pci/drm/ttm/ttm_device.c
+++ b/sys/dev/pci/drm/ttm/ttm_device.c
@@ -154,7 +154,7 @@ int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
 			struct ttm_buffer_object *bo = res->bo;
 			uint32_t num_pages;
 
-			if (!bo)
+			if (!bo || bo->resource != res)
 				continue;
 
 			num_pages = PFN_UP(bo->base.size);