netdev - Re: [PATCH] net: mlx5: Add a missing check on idr

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Message-ID: <20190319143507.GO4823@mtr-leonro.mtl.com>
Date:   Tue, 19 Mar 2019 16:35:07 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Boris Pismenny <borisp@...lanox.com>
Cc:     Aditya Pakki <pakki001@....edu>, "kjlu@....edu" <kjlu@....edu>,
        Saeed Mahameed <saeedm@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Ilya Lesokhin <ilyal@...lanox.com>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: mlx5: Add a missing check on idr_find

On Tue, Mar 19, 2019 at 01:41:49PM +0000, Boris Pismenny wrote:
>
>
> On 3/19/2019 12:18 AM, Aditya Pakki wrote:
> > idr_find() can return a NULL value to 'flow' which is used without a check.
> > The patch adds a check to avoid potential NULL pointer dereference.
>
> Did you encounter this in practice?
> This flow you are suggesting shouldn't be possible, because the handle
> is always there until the socket is destroyed in sk_destruct.
>
> But, I wouldn't mind some defensive coding here.
> Maybe also a WARN_ONCE :)
>
> Could you also release buf in case of an error returned from
> mlx5_fpga_sbu_conn_sendmsg below?
> Otherwise, I could submit a patch for this.

Boris,

Can you please invest ten seconds to read previous emails prior to answering?
https://lkml.org/lkml/2019/3/19/36

Thanks

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