linux-kernel - Re: [PATCH net-next] vringh: fix copy direction of vringh_iov_push

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Message-ID: <f8c51ab6-d328-b574-d5c4-ed4a8cd2c3ec@redhat.com>
Date:   Mon, 28 Oct 2019 11:52:01 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] vringh: fix copy direction of
 vringh_iov_push_kern()


On 2019/10/27 下午6:04, Michael S. Tsirkin wrote:
> On Thu, Oct 24, 2019 at 11:57:18AM +0800, Jason Wang wrote:
>> We want to copy from iov to buf, so the direction was wrong.
>>
>> Note: no real user for the helper, but it will be used by future
>> features.
>>
>> Signed-off-by: Jason Wang <jasowang@...hat.com>
> I'm still inclined to merge it now, incorrect code tends to
> proliferate.


I'm fine with this, so I believe you will merge this patch?

Thanks


>
>> ---
>>   drivers/vhost/vringh.c | 8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
>> index 08ad0d1f0476..a0a2d74967ef 100644
>> --- a/drivers/vhost/vringh.c
>> +++ b/drivers/vhost/vringh.c
>> @@ -852,6 +852,12 @@ static inline int xfer_kern(void *src, void *dst, size_t len)
>>   	return 0;
>>   }
>>   
>> +static inline int kern_xfer(void *dst, void *src, size_t len)
>> +{
>> +	memcpy(dst, src, len);
>> +	return 0;
>> +}
>> +
>>   /**
>>    * vringh_init_kern - initialize a vringh for a kernelspace vring.
>>    * @vrh: the vringh to initialize.
>> @@ -958,7 +964,7 @@ EXPORT_SYMBOL(vringh_iov_pull_kern);
>>   ssize_t vringh_iov_push_kern(struct vringh_kiov *wiov,
>>   			     const void *src, size_t len)
>>   {
>> -	return vringh_iov_xfer(wiov, (void *)src, len, xfer_kern);
>> +	return vringh_iov_xfer(wiov, (void *)src, len, kern_xfer);
>>   }
>>   EXPORT_SYMBOL(vringh_iov_push_kern);
>>   
>> -- 
>> 2.19.1