netdev - Re: net: Initialize return value in gro_cells

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Date:   Wed, 7 Oct 2020 08:50:42 -0700
From:   Gregory Rose <gvrose8192@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        Netdev <netdev@...r.kernel.org>
Subject: Re: net: Initialize return value in gro_cells_receive



On 10/7/2020 1:21 AM, Eric Dumazet wrote:
> 
> 
> On 10/6/20 8:53 PM, Gregory Rose wrote:
>> The 'res' return value is uninitalized and may be returned with
>> some random value.  Initialize to NET_RX_DROP as the default
>> return value.
>>
>> Signed-off-by: Greg Rose <gvrose8192@...il.com>
>>
>> diff --git a/net/core/gro_cells.c b/net/core/gro_cells.c
>> index e095fb871d91..4e835960db07 100644
>> --- a/net/core/gro_cells.c
>> +++ b/net/core/gro_cells.c
>> @@ -13,7 +13,7 @@ int gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb)
>>   {
>>          struct net_device *dev = skb->dev;
>>          struct gro_cell *cell;
>> -       int res;
>> +       int res = NET_RX_DROP;
>>
>>          rcu_read_lock();
>>          if (unlikely(!(dev->flags & IFF_UP)))
> 
> I do not think this is needed.
> 
> Also, when/if sending a patch fixing a bug, we require a Fixes: tag.
> 
> Thanks.
> 
If it's not needed then feel free to ignore it.  It just looked like
the unlikely case returns without setting the return value.

Thanks

- Greg

Thanks,