linux-kernel - [PATCH 3.10 095/173] drm/ttm: Handle in-memory region copies

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Date:	Mon,  2 Dec 2013 11:11:18 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jakob Bornecrantz <jakob@...are.com>,
	Thomas Hellström <thellstrom@...are.com>
Subject: [PATCH 3.10 095/173] drm/ttm: Handle in-memory region copies

3.10-stable review patch.  If anyone has any objections, please let me know.

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

From: Jakob Bornecrantz <jakob@...are.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@...are.com>
Signed-off-by: Thomas Hellström <thellstrom@...are.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/ttm/ttm_bo_util.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -347,7 +347,9 @@ int ttm_bo_move_memcpy(struct ttm_buffer
 	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


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