[PATCH next] drm: writeback: Fix use after free in drm_writeback_connector_cleanup()

[Dan Carpenter]

The drm_writeback_cleanup_job() function frees "pos" so call
list_del(&pos->list_entry) first to avoid a use after free.

Fixes: 1914ba2b91ea ("drm: writeback: Create drmm variants for 
drm_writeback_connector initialization")
Signed-off-by: Dan Carpenter <dan.carpen...@linaro.org>
---
 drivers/gpu/drm/drm_writeback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c
index 3628fbef7752..f139b49af4c9 100644
--- a/drivers/gpu/drm/drm_writeback.c
+++ b/drivers/gpu/drm/drm_writeback.c
@@ -360,8 +360,8 @@ static void drm_writeback_connector_cleanup(struct 
drm_device *dev,
 
        spin_lock_irqsave(&wb_connector->job_lock, flags);
        list_for_each_entry_safe(pos, n, &wb_connector->job_queue, list_entry) {
-               drm_writeback_cleanup_job(pos);
                list_del(&pos->list_entry);
+               drm_writeback_cleanup_job(pos);
        }
        spin_unlock_irqrestore(&wb_connector->job_lock, flags);
 }
-- 
2.47.2