Memory for _manager is allocated using kzalloc() but the result is not checked.
I was led to scrutinize ttm_page_alloc_init() from a smatch warning:
drivers/gpu/drm/ttm/ttm_page_alloc.c:799 ttm_page_alloc_init() error: potential null dereference '_manager'. (kzalloc returns null)
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Zhao Yakui <yakui.zhao@xxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx # 3.5+
Signed-off-by: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
---
This patch applies to stable 3.5 and newer.
V2 - kobject_put(&_manager->kobj) uses a destructor and
container_of() to free _mamanger.
drivers/gpu/drm/ttm/ttm_page_alloc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index bd2a3b4..c64e96c 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -798,6 +798,10 @@ 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) {
+ pr_err("ttm: Could not allocate _manager.\n");
+ return -ENOMEM;
+ }
ttm_page_pool_init_locked(&_manager->wc_pool, GFP_HIGHUSER, "wc");
--
1.7.9.5
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