linux-kernel - Re: [PATCH -next] KVM: s390: Return the correct errno code

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Date:   Thu, 4 Feb 2021 09:42:26 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Cornelia Huck <cohuck@...hat.com>,
        Zheng Yongjun <zhengyongjun3@...wei.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, frankja@...ux.ibm.com,
        david@...hat.com, imbrenda@...ux.ibm.com, hca@...ux.ibm.com,
        gor@...ux.ibm.com
Subject: Re: [PATCH -next] KVM: s390: Return the correct errno code

On 04.02.21 09:32, Cornelia Huck wrote:
> On Thu, 4 Feb 2021 16:05:23 +0800
> Zheng Yongjun <zhengyongjun3@...wei.com> wrote:
> 
>> When valloc failed, should return ENOMEM rather than ENOBUF.
>>
>> Signed-off-by: Zheng Yongjun <zhengyongjun3@...wei.com>
>> ---
>>  arch/s390/kvm/interrupt.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
>> index 2f177298c663..6b7acc27cfa2 100644
>> --- a/arch/s390/kvm/interrupt.c
>> +++ b/arch/s390/kvm/interrupt.c
>> @@ -2252,7 +2252,7 @@ static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
>>  	 */
>>  	buf = vzalloc(len);
>>  	if (!buf)
>> -		return -ENOBUFS;
>> +		return -ENOMEM;
>>  
>>  	max_irqs = len / sizeof(struct kvm_s390_irq);
>>  
> 
> This breaks a user space interface (see the comment right above the
> vzalloc).


Right. Please do not send (generated?) patches without looking at the code
that you are patching.