linux-kernel - [PATCH net] net: page_pool: add missing free_percpu when page_pool

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Message-ID: <20231030091256.2915394-1-shaojijie@huawei.com>
Date:   Mon, 30 Oct 2023 17:12:56 +0800
From:   Jijie Shao <shaojijie@...wei.com>
To:     <hawk@...nel.org>, <ilias.apalodimas@...aro.org>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <jdamato@...tly.com>
CC:     <shenjian15@...wei.com>, <wangjie125@...wei.com>,
        <liuyonglong@...wei.com>, <shaojijie@...wei.com>,
        <linyunsheng@...wei.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH net] net: page_pool: add missing free_percpu when page_pool_init fail

From: Jian Shen <shenjian15@...wei.com>

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: ad6fa1e1ab1b ("page_pool: Add recycle stats")
Signed-off-by: Jian Shen <shenjian15@...wei.com>
Signed-off-by: Jijie Shao <shaojijie@...wei.com>
---
 net/core/page_pool.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 77cb75e63aca..31f923e7b5c4 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -221,8 +221,12 @@ 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);
 
-- 
2.30.0