linux-kernel - RE: [PATCH] hv_netvsc: Fix potential dereference of NULL pointer

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Message-ID: <DM5PR21MB174975EE6EF554BB72C60C01CAD09@DM5PR21MB1749.namprd21.prod.outlook.com>
Date:   Thu, 19 May 2022 13:45:25 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     Yongzhi Liu <lyz_cs@....edu.cn>, KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "sashal@...nel.org" <sashal@...nel.org>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "fuyq@....pku.edu.cn" <fuyq@....pku.edu.cn>
Subject: RE: [PATCH] hv_netvsc: Fix potential dereference of NULL pointer



> -----Original Message-----
> From: Yongzhi Liu <lyz_cs@....edu.cn>
> Sent: Thursday, May 19, 2022 8:10 AM
> To: KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> <haiyangz@...rosoft.com>; Stephen Hemminger
> <sthemmin@...rosoft.com>; wei.liu@...nel.org; Dexuan Cui
> <decui@...rosoft.com>; davem@...emloft.net; kuba@...nel.org;
> pabeni@...hat.com; sashal@...nel.org
> Cc: linux-hyperv@...r.kernel.org; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; fuyq@....pku.edu.cn; Yongzhi Liu
> <lyz_cs@....edu.cn>
> Subject: [PATCH] hv_netvsc: Fix potential dereference of NULL pointer
> 
> [Some people who received this message don't often get email from
> lyz_cs@....edu.cn. Learn why this is important at
> https://aka.ms/LearnAboutSenderIdentification.]
> 
> The return value of netvsc_devinfo_get()
> needs to be checked to avoid use of NULL
> pointer in case of an allocation failure.
> 
> Fixes: 0efeea5fb ("hv_netvsc: Add the support of hibernation")
> 
> Signed-off-by: Yongzhi Liu <lyz_cs@....edu.cn>
> ---
>  drivers/net/hyperv/netvsc_drv.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/hyperv/netvsc_drv.c
> b/drivers/net/hyperv/netvsc_drv.c
> index fde1c49..b1dece6 100644
> --- a/drivers/net/hyperv/netvsc_drv.c
> +++ b/drivers/net/hyperv/netvsc_drv.c
> @@ -2671,7 +2671,10 @@ static int netvsc_suspend(struct hv_device *dev)
> 
>         /* Save the current config info */
>         ndev_ctx->saved_netvsc_dev_info = netvsc_devinfo_get(nvdev);
> -
> +       if (!ndev_ctx->saved_netvsc_dev_info) {
> +               ret = -ENOMEM;
> +               goto out;
> +       }
>         ret = netvsc_detach(net, nvdev);
>  out:
>         rtnl_unlock();

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