linux-kernel - Re: [PATCH] KVM: s390: pci: Fix allocation size of aift kzdev elements

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Date:   Wed, 26 Oct 2022 09:36:42 -0400
From:   Matthew Rosato <mjrosato@...ux.ibm.com>
To:     Rafael Mendonca <rafaelmendsr@...il.com>,
        Eric Farman <farman@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: s390: pci: Fix allocation size of aift kzdev
 elements

On 10/25/22 9:32 PM, Rafael Mendonca wrote:
> The 'kzdev' field of struct 'zpci_aift' is an array of pointers to
> 'kvm_zdev' structs. Allocate the proper size accordingly.
> 
> Reported by Coccinelle:
>   WARNING: Use correct pointer type argument for sizeof
> 
> Fixes: 98b1d33dac5f ("KVM: s390: pci: do initial setup for AEN interpretation")
> Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>

Thanks for reporting & fixing.

Reviewed-by: Matthew Rosato <mjrosato@...ux.ibm.com>

> ---
>  arch/s390/kvm/pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c
> index c50c1645c0ae..ded1af2ddae9 100644
> --- a/arch/s390/kvm/pci.c
> +++ b/arch/s390/kvm/pci.c
> @@ -126,7 +126,7 @@ int kvm_s390_pci_aen_init(u8 nisc)
>  		return -EPERM;
>  
>  	mutex_lock(&aift->aift_lock);
> -	aift->kzdev = kcalloc(ZPCI_NR_DEVICES, sizeof(struct kvm_zdev),
> +	aift->kzdev = kcalloc(ZPCI_NR_DEVICES, sizeof(struct kvm_zdev *),
>  			      GFP_KERNEL);
>  	if (!aift->kzdev) {
>  		rc = -ENOMEM;