drm/ttm: check the return value of kzalloc

[ Upstream commit 19d859a7205bc59ffc38303eb25ae394f61d21dc ]

In the function ttm_page_alloc_init, kzalloc call is made for variable
_manager, we need to check its return value, it may return NULL.

Signed-off-by: Xiongwei Song <sxwjean@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 8715998267730cd3db5511ce9280259854790555..91f9263f3c3bb69197c2f241f97f9a831df4b314 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -821,6 +821,8 @@ int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages)
        pr_info("Initializing pool allocator\n");
 
        _manager = kzalloc(sizeof(*_manager), GFP_KERNEL);
+       if (!_manager)
+               return -ENOMEM;
 
        ttm_page_pool_init_locked(&_manager->wc_pool, GFP_HIGHUSER, "wc");