drm/panfrost: Fix shrinker list corruption by madvise IOCTL

commit 9fc33eaaa979d112d10fea729edcd2a2e21aa912 upstream.

Calling madvise IOCTL twice on BO causes memory shrinker list corruption
and crashes kernel because BO is already on the list and it's added to
the list again, while BO should be removed from the list before it's
re-added. Fix it.

Cc: stable@vger.kernel.org
Fixes: 013b65101315 ("drm/panfrost: Add madvise and shrinker support")
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220630200601.1884120-3-dmitry.osipenko@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index a70261809cdd2fc2eb87beb8ea26525b19468be0..1dfc457bbefc82b2baeb4da108b3f0be11589150 100644 (file)
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -427,8 +427,8 @@ static int panfrost_ioctl_madvise(struct drm_device *dev, void *data,
 
        if (args->retained) {
                if (args->madv == PANFROST_MADV_DONTNEED)
-                       list_add_tail(&bo->base.madv_list,
-                                     &pfdev->shrinker_list);
+                       list_move_tail(&bo->base.madv_list,
+                                      &pfdev->shrinker_list);
                else if (args->madv == PANFROST_MADV_WILLNEED)
                        list_del_init(&bo->base.madv_list);
        }