[PATCH net] net: page_pool: add missing free_percpu when page_pool_init fail

[PATCH net] net: page_pool: add missing free_percpu when page_pool_init fail

[Jijie Shao]

From: Jian Shen <shenjian15@huawei.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@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.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

Re: [PATCH net] net: page_pool: add missing free_percpu when page_pool_init fail

[Yunsheng Lin]

On 2023/10/30 17:12, Jijie Shao wrote:
> From: Jian Shen <shenjian15@huawei.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.

LGTM.
Reviewed-by: Yunsheng Lin <linyunsheng@huawei.com>

> 
> Fixes: ad6fa1e1ab1b ("page_pool: Add recycle stats")
> Signed-off-by: Jian Shen <shenjian15@huawei.com>
> Signed-off-by: Jijie Shao <shaojijie@huawei.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);
>  
> 

Re: [PATCH net] net: page_pool: add missing free_percpu when page_pool_init fail

[Jiri Pirko]

Mon, Oct 30, 2023 at 10:12:56AM CET, shaojijie@huawei.com wrote:
>From: Jian Shen <shenjian15@huawei.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.

Would be nice to see the use of imperative mood in the patch description
too, not only patch subject. Nevertheless, fix looks fine:

Reviewed-by: Jiri Pirko <jiri@nvidia.com>

Re: [PATCH net] net: page_pool: add missing free_percpu when page_pool_init fail

[Ilias Apalodimas]

On Mon, 30 Oct 2023 at 11:17, Jijie Shao <shaojijie@huawei.com> wrote:
>
> From: Jian Shen <shenjian15@huawei.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@huawei.com>
> Signed-off-by: Jijie Shao <shaojijie@huawei.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@linaro.org>

Re: [PATCH net] net: page_pool: add missing free_percpu when page_pool_init fail

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@redhat.com>:

On Mon, 30 Oct 2023 17:12:56 +0800 you wrote:
> From: Jian Shen <shenjian15@huawei.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@huawei.com>
> Signed-off-by: Jijie Shao <shaojijie@huawei.com>
> 
> [...]

Here is the summary with links:
  - [net] net: page_pool: add missing free_percpu when page_pool_init fail
    https://git.kernel.org/netdev/net/c/8ffbd1669ed1

You are awesome, thank you!
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