[PATCH] drm/ttm/tests: fix potential null pointer dereference in ttm_bo_unreserve_bulk()

[Qasim Ijaz]

In the ttm_bo_unreserve_bulk() test function, resv is allocated 
using kunit_kzalloc(), but the subsequent assertion mistakenly 
verifies the ttm_dev pointer instead of checking the resv pointer. 
This mistake means that if allocation for resv fails, the error will 
go undetected, resv will be NULL and a call to dma_resv_init(resv) 
will dereference a NULL pointer. 

Fix the assertion to properly verify the resv pointer.

Fixes: 588c4c8d58c4 ("drm/ttm/tests: Fix a warning in ttm_bo_unreserve_bulk")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Qasim Ijaz <qasdev00@xxxxxxxxx>
---
 drivers/gpu/drm/ttm/tests/ttm_bo_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/tests/ttm_bo_test.c b/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
index f8f20d2f6174..e08e5a138420 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
@@ -340,7 +340,7 @@ static void ttm_bo_unreserve_bulk(struct kunit *test)
 	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
 
 	resv = kunit_kzalloc(test, sizeof(*resv), GFP_KERNEL);
-	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
+	KUNIT_ASSERT_NOT_NULL(test, resv);
 
 	err = ttm_device_kunit_init(priv, ttm_dev, false, false);
 	KUNIT_ASSERT_EQ(test, err, 0);
-- 
2.39.5