linux-kernel - RE: [PATCH v3 1/3] Drivers: hv: check vmbus_device_create() return value in vmbus_process

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Message-ID: <BY2PR0301MB07118DBD8B97EEA900A900B7A04B0@BY2PR0301MB0711.namprd03.prod.outlook.com>
Date:	Tue, 20 Jan 2015 18:33:03 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
CC:	Haiyang Zhang <haiyangz@...rosoft.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dexuan Cui <decui@...rosoft.com>,
	Jason Wang <jasowang@...hat.com>,
	Radim Krčmář <rkrcmar@...hat.com>,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: RE: [PATCH v3 1/3] Drivers: hv: check vmbus_device_create() return
 value in vmbus_process_offer()



> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets@...hat.com]
> Sent: Tuesday, January 20, 2015 7:45 AM
> To: KY Srinivasan; devel@...uxdriverproject.org
> Cc: Haiyang Zhang; linux-kernel@...r.kernel.org; Dexuan Cui; Jason Wang;
> Radim Krčmář; Dan Carpenter
> Subject: [PATCH v3 1/3] Drivers: hv: check vmbus_device_create() return
> value in vmbus_process_offer()
> 
> vmbus_device_create() result is not being checked in
> vmbus_process_offer() and it can fail if kzalloc() fails. Add the check and do
> minor cleanup to avoid additional duplication of "free_channel(); return;"
> block.
> 
> Reported-by: Jason Wang <jasowang@...hat.com>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>

Thanks Vitaly.
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> ---
>  drivers/hv/channel_mgmt.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index
> 2c59f03..01f2c2b 100644
> --- a/drivers/hv/channel_mgmt.c
> +++ b/drivers/hv/channel_mgmt.c
> @@ -341,11 +341,10 @@ static void vmbus_process_offer(struct
> work_struct *work)
>  			if (channel->sc_creation_callback != NULL)
>  				channel->sc_creation_callback(newchannel);
> 
> -			return;
> +			goto out;
>  		}
> 
> -		free_channel(newchannel);
> -		return;
> +		goto err_free_chan;
>  	}
> 
>  	/*
> @@ -364,6 +363,8 @@ static void vmbus_process_offer(struct work_struct
> *work)
>  		&newchannel->offermsg.offer.if_type,
>  		&newchannel->offermsg.offer.if_instance,
>  		newchannel);
> +	if (!newchannel->device_obj)
> +		goto err_free_chan;
> 
>  	/*
>  	 * Add the new device to the bus. This will kick off device-driver @@
> -379,9 +380,12 @@ static void vmbus_process_offer(struct work_struct
> *work)
>  		list_del(&newchannel->listentry);
>  		spin_unlock_irqrestore(&vmbus_connection.channel_lock,
> flags);
>  		kfree(newchannel->device_obj);
> -
> -		free_channel(newchannel);
> +		goto err_free_chan;
>  	}
> +out:
> +	return;
> +err_free_chan:
> +	free_channel(newchannel);
>  }
> 
>  enum {
> --
> 1.9.3

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