netdev - Re: [PATCH net-next] vsock: correct removal of socket from the list

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Message-ID: <20190613144750.GA10708@stefanha-x1.localdomain>
Date:   Thu, 13 Jun 2019 15:47:50 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Sunil Muthuswamy <sunilmut@...rosoft.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Dexuan Cui <decui@...rosoft.com>
Subject: Re: [PATCH net-next] vsock: correct removal of socket from the list

On Thu, Jun 13, 2019 at 03:52:27AM +0000, Sunil Muthuswamy wrote:
> The current vsock code for removal of socket from the list is both
> subject to race and inefficient. It takes the lock, checks whether
> the socket is in the list, drops the lock and if the socket was on the
> list, deletes it from the list. This is subject to race because as soon
> as the lock is dropped once it is checked for presence, that condition
> cannot be relied upon for any decision. It is also inefficient because
> if the socket is present in the list, it takes the lock twice.
> 
> Signed-off-by: Sunil Muthuswamy <sunilmut@...rosoft.com>
> ---
>  net/vmw_vsock/af_vsock.c | 38 +++++++-------------------------------
>  1 file changed, 7 insertions(+), 31 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>

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