From: Leon Romanovsky <leon@kernel.org>
To: Pan Bian <bianpan201603@163.com>
Cc: Yishai Hadas <yishaih@mellanox.com>,
Doug Ledford <dledford@redhat.com>,
Sean Hefty <sean.hefty@intel.com>,
Hal Rosenstock <hal.rosenstock@gmail.com>,
linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
Pan Bian <bianpan2016@163.com>
Subject: Re: [PATCH 1/1] infiniband: hw: mlx4: fix improper return value
Date: Sun, 4 Dec 2016 08:15:01 +0200 [thread overview]
Message-ID: <20161204061501.GG4497@leon.nu> (raw)
In-Reply-To: <1480830544-5002-1-git-send-email-bianpan201603@163.com>
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On Sun, Dec 04, 2016 at 01:49:04PM +0800, Pan Bian wrote:
> From: Pan Bian <bianpan2016@163.com>
>
> If uhw->inlen is non-zero, the value of variable err is 0 if the copy
> succeeds. Then, if kzalloc() or kmalloc() returns a NULL pointer, it
> will return 0 to the callers. As a result, the callers cannot detect the
> errors. This patch fixes the bug, assigning "-ENOMEM" to err before
> the NULL pointer checks.
>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=189031
>
> Signed-off-by: Pan Bian <bianpan2016@163.com>
> ---
> drivers/infiniband/hw/mlx4/main.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
> index b597e82..f6c5158 100644
> --- a/drivers/infiniband/hw/mlx4/main.c
> +++ b/drivers/infiniband/hw/mlx4/main.c
> @@ -455,6 +455,7 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
> sizeof(resp.response_length);
> in_mad = kzalloc(sizeof *in_mad, GFP_KERNEL);
> out_mad = kmalloc(sizeof *out_mad, GFP_KERNEL);
> + err = -ENOMEM;
> if (!in_mad || !out_mad)
> goto out;
In such case, the err initialization at the beginning of
mlx4_ib_query_device function is not necessary. Can you please remove it?
Besides that, look good.
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
>
> --
> 1.9.1
>
>
> --
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next prev parent reply other threads:[~2016-12-04 6:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-04 5:49 [PATCH 1/1] infiniband: hw: mlx4: fix improper return value Pan Bian
2016-12-04 6:15 ` Leon Romanovsky [this message]
2016-12-04 6:45 Pan Bian
2016-12-04 7:17 ` Leon Romanovsky
2016-12-14 19:35 ` Doug Ledford
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