linux-kernel - Re: [PATCH 3/4] KVM-S390: Less function calls in kvm_s390_import_bp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20160822150048.309a3e10.cornelia.huck@de.ibm.com>
Date:   Mon, 22 Aug 2016 15:00:48 +0200
From:   Cornelia Huck <cornelia.huck@...ibm.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        Christian Bornträger <borntraeger@...ibm.com>,
        David Hildenbrand <dahi@...ux.vnet.ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 3/4] KVM-S390: Less function calls in
 kvm_s390_import_bp_data() after error detection

On Wed, 17 Aug 2016 20:10:37 +0200
SF Markus Elfring <elfring@...rs.sourceforge.net> wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Wed, 17 Aug 2016 19:25:50 +0200
> 
> The kfree() function was called in a few cases by the
> kvm_s390_import_bp_data() function during error handling
> even if a passed variable contained a null pointer.
> 
> Adjust jump targets according to the Linux coding style convention.

NACK.

> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  arch/s390/kvm/guestdbg.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 

> @@ -273,10 +273,12 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
>  	vcpu->arch.guestdbg.nr_hw_wp = nr_wp;
>  	vcpu->arch.guestdbg.hw_wp_info = wp_info;
>  	return 0;
> -error:
> -	kfree(bp_data);
> -	kfree(wp_info);
> +free_bp_info:
>  	kfree(bp_info);
> +free_wp_info:
> +	kfree(wp_info);
> +free_bp_data:
> +	kfree(bp_data);
>  	return ret;
>  }
> 

This replaces a perfectly fine fallthrough with some horrible labels.
Please don't do that.