[PATCH 5/6] drm/ttm: reject empty range manager sizes

[Jiale Yao]

A zero page count reaches drm_mm_init() and causes its zero-range BUG
check to fire. Return an error before allocating and installing the
range manager.

Fixes: 77ef8bbc87be ("drm: make drm_mm_init() return void")
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 drivers/gpu/drm/ttm/ttm_range_manager.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_range_manager.c b/drivers/gpu/drm/ttm/ttm_range_manager.c
index b818836f0726..5fd484ae1706 100644
--- a/drivers/gpu/drm/ttm/ttm_range_manager.c
+++ b/drivers/gpu/drm/ttm/ttm_range_manager.c
@@ -184,6 +184,9 @@ int ttm_range_man_init_nocheck(struct ttm_device *bdev,
 	struct ttm_resource_manager *man;
 	struct ttm_range_manager *rman;
 
+	if (!p_size)
+		return -EINVAL;
+
 	rman = kzalloc_obj(*rman);
 	if (!rman)
 		return -ENOMEM;
-- 
2.34.1