linux-kernel - Re: [PATCH -next] RDMA/core: Properly return the error code of rdma_set_src_addr

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Date:   Thu, 20 Sep 2018 09:13:45 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
CC:     <dledford@...hat.com>, <leon@...nel.org>, <parav@...lanox.com>,
        <danielj@...lanox.com>, <linux-kernel@...r.kernel.org>,
        <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH -next] RDMA/core: Properly return the error code of
 rdma_set_src_addr_rcu

On 2018/9/20 0:14, Jason Gunthorpe wrote:
> On Wed, Sep 19, 2018 at 08:28:38PM +0800, YueHaibing wrote:
>> rdma_set_src_addr_rcu should check copy_src_l2_addr fails,
>> rather than always return 0. Also copy_src_l2_addr should return
>> 'ret' as its return value while rdma_translate_ip fails.
>>
>> Fixes: c31d4b2ddf07 ("RDMA/core: Protect against changing dst->dev during destination resolve")
>> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
>> Reviewed-by: Parav Pandit <parav@...lanox.com>
>> ---
>>  drivers/infiniband/core/addr.c | 9 ++++++---
>>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> Applied to for-next, thanks
> 
>> diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
>> index 7a0356c..8a31b11 100644
>> --- a/drivers/infiniband/core/addr.c
>> +++ b/drivers/infiniband/core/addr.c
>> @@ -468,7 +468,7 @@ static int addr_resolve_neigh(const struct dst_entry *dst,
>>  	return ret;
>>  }
>>  
>> -static void copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
>> +static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
>>  			     const struct sockaddr *dst_in,
>>  			     const struct dst_entry *dst,
>>  			     const struct net_device *ndev)
> 
> I fixed the indenting as Parav pointed out
> 
>> @@ -492,6 +492,8 @@ static void copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
>>  						RDMA_NETWORK_IPV6;
>>  	else
>>  		dev_addr->network = RDMA_NETWORK_IB;
>> +
>> +	return ret;
>>  }
>>  
>>  static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
>> @@ -499,6 +501,7 @@ static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
>>  				 const struct sockaddr *dst_in,
>>  				 const struct dst_entry *dst)
>>  {
>> +	int ret;
>>  	struct net_device *ndev = READ_ONCE(dst->dev);
>>  
>>  	*ndev_flags = ndev->flags;
>> @@ -515,8 +518,8 @@ static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
>>  			return -ENODEV;
>>  	}
>>  
>> -	copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
>> -	return 0;
>> +	ret = copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
>> +	return ret;
>>  }
> 
> And made this just 'return copy_src_l2_addr' without the ret.

Thank you.

> 
> Jason
> 
> .
>