netdev - Re: [PATCH] can: check for null sk before deferencing it via the call to sock

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Message-ID: <8fdd94bd-da4e-784e-3832-6c1bb5e1f432@pengutronix.de>
Date:   Tue, 17 Oct 2017 07:49:58 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Colin King <colin.king@...onical.com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        "David S . Miller" <davem@...emloft.net>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] can: check for null sk before deferencing it via the call
 to sock_net

On 09/08/2017 05:02 PM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The assignment of net via call sock_net will dereference sk. This
> is performed before a sanity null check on sk, so there could be
> a potential null dereference on the sock_net call if sk is null.
> Fix this by assigning net after the sk null check. Also replace
> the sk == NULL with the more usual !sk idiom.
> 
> Detected by CoverityScan CID#1431862 ("Dereference before null check")
> 
> Fixes: 384317ef4187 ("can: network namespace support for CAN_BCM protocol")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Applied to can.

Tnx,
Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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