From: Xin Xiong <xiongx18@fudan.edu.cn>
To: Saeed Mahameed <saeedm@mellanox.com>,
Leon Romanovsky <leon@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
KP Singh <kpsingh@chromium.org>,
Tariq Toukan <tariqt@mellanox.com>,
netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-kernel@vger.kernel.org, bpf@vger.kernel.org
Cc: yuanxzhang@fudan.edu.cn, Xin Xiong <xiongx18@fudan.edu.cn>,
Xiyu Yang <xiyuyang19@fudan.edu.cn>,
Xin Tan <tanxin.ctf@gmail.com>
Subject: [PATCH v2] net/mlx5e: fix bpf_prog reference count leaks in mlx5e_alloc_rq
Date: Thu, 30 Jul 2020 18:29:41 +0800 [thread overview]
Message-ID: <20200730102941.5536-1-xiongx18@fudan.edu.cn> (raw)
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")
Signed-off-by: Xin Xiong <xiongx18@fudan.edu.cn>
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
---
v1 -> v2:
- Amended parts of wording to be better understood
- Added Fixes tag
---
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index a836a02a2116..8e1b1ab416d8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -419,7 +419,7 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
err = mlx5_wq_ll_create(mdev, &rqp->wq, rqc_wq, &rq->mpwqe.wq,
&rq->wq_ctrl);
if (err)
- return err;
+ goto err_rq_wq_destroy;
rq->mpwqe.wq.db = &rq->mpwqe.wq.db[MLX5_RCV_DBR];
@@ -470,7 +470,7 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
err = mlx5_wq_cyc_create(mdev, &rqp->wq, rqc_wq, &rq->wqe.wq,
&rq->wq_ctrl);
if (err)
- return err;
+ goto err_rq_wq_destroy;
rq->wqe.wq.db = &rq->wqe.wq.db[MLX5_RCV_DBR];
--
2.25.1
next reply other threads:[~2020-07-30 10:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-30 10:29 Xin Xiong [this message]
2020-07-30 23:16 ` [PATCH v2] net/mlx5e: fix bpf_prog reference count leaks in mlx5e_alloc_rq Jakub Kicinski
2020-07-30 23:18 ` Saeed Mahameed
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