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Subject[PATCH 3.5 11/90] drm/ttm: Handle in-memory region copies
Date
3.5.7.27 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jakob Bornecrantz <jakob@vmware.com>

commit 9a0599ddeae012a771bba5e23393fc52d8a59d89 upstream.

Fix the case where the ttm pointer may be NULL causing
a NULL pointer dereference.

Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Thomas Hellström <thellstrom@vmware.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
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 f8187ea..2d69262 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -342,7 +342,9 @@ 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)
goto out1;
--
1.8.3.2
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