linux-kernel - Re: [PATCH] infiniband/i40iw: Fix a use after free in i40iw_cm_event

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Message-ID: <20210311182114.GA2733907@nvidia.com>
Date:   Thu, 11 Mar 2021 14:21:14 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lv Yunlong <lyl2019@...l.ustc.edu.cn>, shiraz.saleem@...el.com
Cc:     faisal.latif@...el.com, dledford@...hat.com,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] infiniband/i40iw: Fix a use after free in
 i40iw_cm_event_handler

On Wed, Mar 10, 2021 at 07:14:14PM -0800, Lv Yunlong wrote:
> In the case of I40IW_CM_EVENT_ABORTED, i40iw_event_connect_error()
> could be called to free the event->cm_node. However, event->cm_node
> will be used after and cause use after free. It needs to add flags
> to inform that event->cm_node has been freed.
> 
> Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>
> ---
>  drivers/infiniband/hw/i40iw/i40iw_cm.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)

This might be OK (though I don't like the free variable), Shiraz??

Jason