netdev - Re: [PATCH v2] net/mlx5e: fix bpf_prog reference count leaks in mlx5e_alloc

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Date:   Thu, 30 Jul 2020 23:18:10 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "songliubraving@...com" <songliubraving@...com>,
        "hawk@...nel.org" <hawk@...nel.org>, "kafai@...com" <kafai@...com>,
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        "ast@...nel.org" <ast@...nel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "xiongx18@...an.edu.cn" <xiongx18@...an.edu.cn>,
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        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...lanox.com>
CC:     "xiyuyang19@...an.edu.cn" <xiyuyang19@...an.edu.cn>,
        "tanxin.ctf@...il.com" <tanxin.ctf@...il.com>,
        "yuanxzhang@...an.edu.cn" <yuanxzhang@...an.edu.cn>
Subject: Re: [PATCH v2] net/mlx5e: fix bpf_prog reference count leaks in
 mlx5e_alloc_rq

On Thu, 2020-07-30 at 18:29 +0800, Xin Xiong wrote:
> The function invokes bpf_prog_inc(), which increases the reference
> count of a bpf_prog object "rq->xdp_prog" if the object isn't NULL.
> 
> The refcount leak issues take place in two error handling paths. When
> either mlx5_wq_ll_create() or mlx5_wq_cyc_create() fails, the
> function
> simply returns the error code and forgets to drop the reference count
> increased earlier, causing a reference count leak of "rq->xdp_prog".
> 
> Fix this issue by jumping to the error handling path
> err_rq_wq_destroy
> while either function fails.
> 
> Fixes: 422d4c401edd ("net/mlx5e: RX, Split WQ objects for different
> RQ
> types")
> 

Please don't break the line of the fixes tag.
I will fix this up.

> Signed-off-by: Xin Xiong <xiongx18@...an.edu.cn>
> Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
> Signed-off-by: Xin Tan <tanxin.ctf@...il.com>
> ---
> v1 -> v2:
> - Amended parts of wording to be better understood
> - Added Fixes tag
> ---

Applied to net-mlx5, Thanks !