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Fri, 21 Feb 2020 09:43:36 -0800 (PST) Received: from [192.168.178.40] ([151.20.135.128]) by smtp.gmail.com with ESMTPSA id l131sm4908318wmf.31.2020.02.21.09.43.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Feb 2020 09:43:36 -0800 (PST) Subject: Re: [PATCH v6 14/22] KVM: Clean up local variable usage in __kvm_set_memory_region() To: Sean Christopherson Cc: Paul Mackerras , Christian Borntraeger , Janosch Frank , David Hildenbrand , Cornelia Huck , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Marc Zyngier , James Morse , Julien Thierry , Suzuki K Poulose , linux-mips@vger.kernel.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, Christoffer Dall , Peter Xu , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= References: <20200218210736.16432-1-sean.j.christopherson@intel.com> <20200218210736.16432-15-sean.j.christopherson@intel.com> From: Paolo Bonzini Message-ID: <1467b8cd-3631-b5da-b285-dbdf31b75af7@redhat.com> Date: Fri, 21 Feb 2020 18:43:34 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20200218210736.16432-15-sean.j.christopherson@intel.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org On 18/02/20 22:07, Sean Christopherson wrote: > -sorted by update_memslots(), and the old > * memslot needs to be referenced after calling update_memslots(), e.g. > - * to free its resources and for arch specific behavior. > + * to free its resources and for arch specific behavior. Kill @tmp > + * after making a copy to deter potentially dangerous usage. > */ > - old = *slot; > + tmp = id_to_memslot(__kvm_memslots(kvm, as_id), id); > + old = *tmp; > + tmp = NULL; > + Also: old = *id_to_memslot(...). Paolo