linux-kernel - RE: [PATCH] netvsc: fix dereference before null check errors

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Message-ID: <BLUPR03MB141236E1502819C7B992C9F9CA330@BLUPR03MB1412.namprd03.prod.outlook.com>
Date:   Mon, 27 Mar 2017 00:50:27 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     Colin King <colin.king@...onical.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] netvsc: fix dereference before null check errors



> -----Original Message-----
> From: Colin King [mailto:colin.king@...onical.com]
> Sent: Saturday, March 25, 2017 10:27 AM
> To: KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> <haiyangz@...rosoft.com>; Stephen Hemminger <sthemmin@...rosoft.com>;
> devel@...uxdriverproject.org; netdev@...r.kernel.org
> Cc: kernel-janitors@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH] netvsc: fix dereference before null check errors
> 
> From: Colin Ian King <colin.king@...onical.com>
> 
> ndev is being checked to see if it is a null pointer however before
> the null check ndev is being dereferenced; hence there is a potential
> null pointer dereference bug that needs fixing. Fix this by only
> dereferencing ndev after the null check.
> 
> Detected by CoverityScan, CID#1420760, CID#140761 ("Dereference
> before null check")
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>

Thank you!