netdev - Re: [PATCH net-next] net: fman: memac: Uninitialized variable on error path

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Date:   Thu, 25 Aug 2022 10:36:16 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Madalin Bucur <madalin.bucur@....com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Camelia Groza <camelia.groza@....com>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net-next] net: fman: memac: Uninitialized variable on
 error path



On 8/25/22 10:32 AM, Sean Anderson wrote:
> 
> 
> On 8/25/22 9:17 AM, Dan Carpenter wrote:
>> The "fixed_link" is only allocated sometimes but it's freed
>> unconditionally in the error handling.  Set it to NULL so we don't free
>> uninitialized data.
>> 
>> Fixes: 9ea4742a55ca ("net: fman: Configure fixed link in memac_initialization")
>> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
>> ---
>>  drivers/net/ethernet/freescale/fman/mac.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/drivers/net/ethernet/freescale/fman/mac.c b/drivers/net/ethernet/freescale/fman/mac.c
>> index c376b9bf657d..f9a3f85760fb 100644
>> --- a/drivers/net/ethernet/freescale/fman/mac.c
>> +++ b/drivers/net/ethernet/freescale/fman/mac.c
>> @@ -389,7 +389,7 @@ static int memac_initialization(struct mac_device *mac_dev,
>>  {
>>  	int			 err;
>>  	struct fman_mac_params	 params;
>> -	struct fixed_phy_status *fixed_link;
>> +	struct fixed_phy_status *fixed_link = NULL;
>>  
>>  	mac_dev->set_promisc		= memac_set_promiscuous;
>>  	mac_dev->change_addr		= memac_modify_mac_address;
>> 
> 
> This is also fixed by [1]
> 
> --Sean
> 
> [1] https://lore.kernel.org/netdev/20220818161649.2058728-10-sean.anderson@seco.com/
> 

Whoops, I didn't read this correctly.

Reviewed-by: Sean Anderson <sean.anderson@...o.com>