netdev - Re: [PATCH net v2 1/2] Check the return value of get

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Date:   Tue, 3 Aug 2021 19:45:56 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     Petko Manolov <petko.manolov@...sulko.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, gregkh@...uxfoundation.org,
        Petko Manolov <petkan@...leusys.com>
Subject: Re: [PATCH net v2 1/2] Check the return value of get_geristers() and
 friends;

On 8/3/21 7:18 PM, Petko Manolov wrote:
> From: Petko Manolov <petkan@...leusys.com>
> 
> Certain call sites of get_geristers() did not do proper error handling.  This
> could be a problem as get_geristers() typically return the data via pointer to a
> buffer.  If an error occured the code is carelessly manipulating the wrong data.
> 
> Signed-off-by: Petko Manolov <petkan@...leusys.com>
> ---
>   drivers/net/usb/pegasus.c | 104 ++++++++++++++++++++++++++------------
>   1 file changed, 72 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
> index 9a907182569c..06e3ae6209b0 100644
> --- a/drivers/net/usb/pegasus.c
> +++ b/drivers/net/usb/pegasus.c
> @@ -132,9 +132,15 @@ static int get_registers(pegasus_t *pegasus, __u16 indx, __u16 size, void *data)
>   static int set_registers(pegasus_t *pegasus, __u16 indx, __u16 size,
>   			 const void *data)
>   {
> -	return usb_control_msg_send(pegasus->usb, 0, PEGASUS_REQ_SET_REGS,
> +	int ret;
> +
> +	ret = usb_control_msg_send(pegasus->usb, 0, PEGASUS_REQ_SET_REGS,
>   				    PEGASUS_REQT_WRITE, 0, indx, data, size,
>   				    1000, GFP_NOIO);
> +	if (ret < 0)
> +		netif_dbg(pegasus, drv, pegasus->net, "%s failed with %d\n", __func__, ret);
> +
> +	return ret;
>   }
>   
>   /*
> @@ -145,10 +151,15 @@ static int set_registers(pegasus_t *pegasus, __u16 indx, __u16 size,
>   static int set_register(pegasus_t *pegasus, __u16 indx, __u8 data)
>   {
>   	void *buf = &data;
> +	int ret;
>   
> -	return usb_control_msg_send(pegasus->usb, 0, PEGASUS_REQ_SET_REG,
> +	ret = usb_control_msg_send(pegasus->usb, 0, PEGASUS_REQ_SET_REG,
>   				    PEGASUS_REQT_WRITE, data, indx, buf, 1,
>   				    1000, GFP_NOIO);
> +	if (ret < 0)
> +		netif_dbg(pegasus, drv, pegasus->net, "%s failed with %d\n", __func__, ret);
> +
> +	return ret;
>   }
>   
>   static int update_eth_regs_async(pegasus_t *pegasus)
> @@ -188,10 +199,9 @@ static int update_eth_regs_async(pegasus_t *pegasus)
>   
>   static int __mii_op(pegasus_t *p, __u8 phy, __u8 indx, __u16 *regd, __u8 cmd)
>   {
> -	int i;
> -	__u8 data[4] = { phy, 0, 0, indx };
> +	int i, ret = -ETIMEDOUT;
>   	__le16 regdi;
> -	int ret = -ETIMEDOUT;
> +	__u8 data[4] = { phy, 0, 0, indx };
>   
>   	if (cmd & PHY_WRITE) {
>   		__le16 *t = (__le16 *) & data[1];
> @@ -211,8 +221,9 @@ static int __mii_op(pegasus_t *p, __u8 phy, __u8 indx, __u16 *regd, __u8 cmd)
>   		goto fail;
		^^^^^^^^^

I really don't want You to spin this series one more time, but ret 
initialization is missed here again :) Maybe, it's not really important 
here...

And Fixes or CC stable is missed too


With regards,
Pavel Skripkin