Subject: Re: [PATCH net-next 1/6] net: qualcomm: rmnet: Remove the rmnet_map_results enum

From: Subash Abhinov Kasiviswanathan <[email-masked]>
Date: Tue, 05 Dec 2017 12:02:30 -0700

> This will crash, you didn't test the new code path that does the
> kfree_skb().
> 
> You should use an SKB helper function which will realloc the headroom
> if ETH_HLEN is not available, instead of failing.
...
> That is definitely not the only thing this change is doing:
> Previously these paths would return "RMNET_MAP_CONSUMED":
> Causing this code to return.
> Now, instead the code jumps to fail:
> 
>> @@ -142,7 +142,11 @@ static int rmnet_map_egress_handler(struct 
>> sk_buff *skb,
>> 
>>  	skb->protocol = htons(ETH_P_MAP);
>> 
>> -	return RMNET_MAP_SUCCESS;
>> +	return 0;
>> +
>> +fail:
>> +	kfree_skb(skb);
>> +	return -ENOMEM;
>>  }
>> 
> 
> Which frees the SKB.
> 
> This is a behavioral change, perhaps a bug fix.
> 
> Well, nobody knows because you do not explain this at all in your
> commit message.
> 
> Do not mix functional changes with cleanups.  If you want to change how
> freeing the SKB is done, do it in a separate change from the patch that
> removes this enumeration.
> 
> Thank you.

Hi David

I will send the change in freeing behavior as a bug fix for net and then
post updates on this series after it.

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