linux-kernel - Re: [PATCH] infiniband/qedr: Potential null ptr dereference of qp

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Date:   Tue, 25 Dec 2018 06:26:10 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Aditya Pakki <pakki001@....edu>
Cc:     kjlu@....edu, Michal Kalderon <Michal.Kalderon@...ium.com>,
        Ariel Elior <Ariel.Elior@...ium.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] infiniband/qedr: Potential null ptr dereference of qp

On Mon, Dec 24, 2018 at 12:24:45PM -0600, Aditya Pakki wrote:
> idr_find() may fail and return a NULL pointer. The fix checks the
> return value of the function and returns an error in case of NULL.
>
> Signed-off-by: Aditya Pakki <pakki001@....edu>
> ---
>  drivers/infiniband/hw/qedr/qedr_iw_cm.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/infiniband/hw/qedr/qedr_iw_cm.c b/drivers/infiniband/hw/qedr/qedr_iw_cm.c
> index 505fa3648762..93b16237b767 100644
> --- a/drivers/infiniband/hw/qedr/qedr_iw_cm.c
> +++ b/drivers/infiniband/hw/qedr/qedr_iw_cm.c
> @@ -492,6 +492,8 @@ int qedr_iw_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
>  	int i;
>
>  	qp = idr_find(&dev->qpidr.idr, conn_param->qpn);
> +	if (unlikely(!qp))
> +		return -EINVAL;

As was already pointed, qedr is racy in their accesses to idr_find() and
NULL pointer is less worry about their IDR code.

>
>  	laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
>  	raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
> --
> 2.17.1
>

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