This is a note to let you know that I've just added the patch titled
drm/ttm: Fix ttm_bo_move_memcpy() for subclassed struct ttm_resource
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-ttm-fix-ttm_bo_move_memcpy-for-subclassed-struct-ttm_resource.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From efcefc7127290e7e9fa98dea029163ad8eda8fb3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= <thomas.hellstrom@xxxxxxxxxxxxxxx>
Date: Tue, 31 Aug 2021 09:15:36 +0200
Subject: drm/ttm: Fix ttm_bo_move_memcpy() for subclassed struct ttm_resource
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From: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
commit efcefc7127290e7e9fa98dea029163ad8eda8fb3 upstream.
The code was making a copy of a struct ttm_resource. However,
recently the struct ttm_resources were allowed to be subclassed and
also were allowed to be malloced, hence the driver could end up assuming
the copy we handed it was subclassed and worse, the original could have
been freed at this point.
Fix this by using the original struct ttm_resource before it is
potentially freed in ttm_bo_move_sync_cleanup()
v2: Base on drm-misc-next-fixes rather than drm-tip.
Reported-by: Ben Skeggs <skeggsb@xxxxxxxxx>
Reported-by: Dave Airlie <airlied@xxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 3bf3710e3718 ("drm/ttm: Add a generic TTM memcpy move for page-based iomem")
Signed-off-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20210831071536.80636-1-thomas.hellstrom@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo_util.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -143,7 +143,6 @@ int ttm_bo_move_memcpy(struct ttm_buffer
struct ttm_resource *src_mem = bo->resource;
struct ttm_resource_manager *src_man =
ttm_manager_type(bdev, src_mem->mem_type);
- struct ttm_resource src_copy = *src_mem;
union {
struct ttm_kmap_iter_tt tt;
struct ttm_kmap_iter_linear_io io;
@@ -173,11 +172,11 @@ int ttm_bo_move_memcpy(struct ttm_buffer
}
ttm_move_memcpy(bo, dst_mem->num_pages, dst_iter, src_iter);
- src_copy = *src_mem;
- ttm_bo_move_sync_cleanup(bo, dst_mem);
if (!src_iter->ops->maps_tt)
- ttm_kmap_iter_linear_io_fini(&_src_iter.io, bdev, &src_copy);
+ ttm_kmap_iter_linear_io_fini(&_src_iter.io, bdev, src_mem);
+ ttm_bo_move_sync_cleanup(bo, dst_mem);
+
out_src_iter:
if (!dst_iter->ops->maps_tt)
ttm_kmap_iter_linear_io_fini(&_dst_iter.io, bdev, dst_mem);
Patches currently in stable-queue which might be from thomas.hellstrom@xxxxxxxxxxxxxxx are
queue-5.14/drm-ttm-fix-ttm_bo_move_memcpy-for-subclassed-struct-ttm_resource.patch
