From 9a0599ddeae012a771bba5e23393fc52d8a59d89 Mon Sep 17 00:00:00 2001 From: Jakob Bornecrantz Date: Wed, 30 Oct 2013 02:46:56 -0700 Subject: [PATCH] drm/ttm: Handle in-memory region copies MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fix the case where the ttm pointer may be NULL causing a NULL pointer dereference. Signed-off-by: Jakob Bornecrantz Signed-off-by: Thomas Hellström Cc: stable@vger.kernel.org --- drivers/gpu/drm/ttm/ttm_bo_util.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c index 7cc904d3a4d1..8369e35c0dce 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_util.c +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c @@ -348,7 +348,9 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo, if (old_iomap == NULL && ttm == NULL) goto out2; - if (ttm->state == tt_unpopulated) { + /* TTM might be null for moves within the same region. + */ + if (ttm && ttm->state == tt_unpopulated) { ret = ttm->bdev->driver->ttm_tt_populate(ttm); if (ret) { /* if we fail here don't nuke the mm node -- GitLab