netdev - Re: [PATCH V2 net] net/tls: Protect from calling tls_dev

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Message-ID: <20201125173218.60a8a7ff@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 25 Nov 2020 17:32:18 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Saeed Mahameed <saeedm@...dia.com>
Cc:     <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
        "Maxim Mikityanskiy" <maximmi@...lanox.com>
Subject: Re: [PATCH V2 net] net/tls: Protect from calling tls_dev_del for
 TLS RX twice

On Wed, 25 Nov 2020 14:18:10 -0800 Saeed Mahameed wrote:
> From: Maxim Mikityanskiy <maximmi@...lanox.com>
> 
> tls_device_offload_cleanup_rx doesn't clear tls_ctx->netdev after
> calling tls_dev_del if TLX TX offload is also enabled. Clearing
> tls_ctx->netdev gets postponed until tls_device_gc_task. It leaves a
> time frame when tls_device_down may get called and call tls_dev_del for
> RX one extra time, confusing the driver, which may lead to a crash.
> 
> This patch corrects this racy behavior by adding a flag to prevent
> tls_device_down from calling tls_dev_del the second time.
> 
> Fixes: e8f69799810c ("net/tls: Add generic NIC offload infrastructure")
> Signed-off-by: Maxim Mikityanskiy <maximmi@...lanox.com>
>  Signed-off-by: Saeed Mahameed <saeedm@...dia.com>

Applied, thanks!