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

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Message-ID: <CAC_iWj+V8KB2TE=6e0z4SRoq7pY+3gStKawX_-8UfYh+cP9ndQ@mail.gmail.com>
Date:   Wed, 1 Nov 2023 13:11:10 +0200
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Jijie Shao <shaojijie@...wei.com>
Cc:     hawk@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, jdamato@...tly.com,
        shenjian15@...wei.com, wangjie125@...wei.com,
        liuyonglong@...wei.com, linyunsheng@...wei.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: page_pool: add missing free_percpu when
 page_pool_init fail

On Mon, 30 Oct 2023 at 11:17, Jijie Shao <shaojijie@...wei.com> wrote:
>
> 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
>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>