net: page_pool: add missing free_percpu when page_pool_init fail

When ptr_ring_init() returns failure in page_pool_init(), free_percpu()
is not called to free pool->recycle_stats, which may cause memory
leak.

Fixes: ad6fa1e ("page_pool: Add recycle stats")
Signed-off-by: Jian Shen <[email protected]>
Signed-off-by: Jijie Shao <[email protected]>
Reviewed-by: Yunsheng Lin <[email protected]>
Reviewed-by: Jiri Pirko <[email protected]>
Reviewed-by: Somnath Kotur <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: IronShen

net/core/page_pool.c

@@ -217,8 +217,12 @@ static int page_pool_init(struct page_pool *pool,
 		return -ENOMEM;
 #endif
 
-	if (ptr_ring_init(&pool->ring, ring_qsize, GFP_KERNEL) < 0)
+	if (ptr_ring_init(&pool->ring, ring_qsize, GFP_KERNEL) < 0) {
+#ifdef CONFIG_PAGE_POOL_STATS
+		free_percpu(pool->recycle_stats);
+#endif
 		return -ENOMEM;
+	}
 
 	atomic_set(&pool->pages_state_release_cnt, 0);